REQUEST FOR PROPOSALS
Engineering Design and Specifications
BRIDGE TO BRIDGE Underpass Project
City Contact Representative
Community Development Director
Fax #: 970/641-8051
This Request for Proposal (RFP) has been developed to solicit proposals from engineering
consultants who have specific expertise in the design of bicycle/pedestrian trail structures across
state highways and working on projects subject to FEMA regulations for developing facilities in
the designated Floodway.
Responses Due: November 12, 2008
Close of Business: 5:00 P.M.
1.0 THE SOLICITATION
The City of Gunnison is seeking a Colorado Professional Engineer to develop a set of detailed
civil engineering plan designs for non-motorized access across two sections of highway in the
vicinity of the City. The purpose of this project is to construct bicycle/pedestrian structures
providing connectivity to trail segments of the BRIDGE TO BRIDGE trails project as part of the
City of Gunnison Trails Master
The initial thought is develop non-
motorized underpasses at two
bridges crossing the Gunnison River.
One bridge is on Highway 50 west of
Gunnison (TWIN BRIDGES SEGMENT)
and the other is on Highway 135
north of Gunnison (UNDERPASS AT
NORTH BRIDGE SEGMENT).
However, the City is open to
exploring other means to accomplish
highway crossings. Alternatives
include, but are not limited to box
culverts, or pedestrian overpass
In addition to the underpass crossings,
two non-motorized bridges crossing the
Gunnison River will also be designed.
One bridge, adjacent to Highway 50,
will cross the river and connect to the
Whitewater Park. The other bridge
will be adjacent to Highway 135 and
will connect the underpass structure to
the boat launch located on the north
The City of Gunnison will utilize
Trails Design and Management
Handbook (Open Space and Trails
Program, Pitkin County, Colorado) and
any other applicable codes as a basis
for general trail designs.
The City of Gunnison has adopted a
Trails Master Plan to construct a trails
system in, and around the city to
provide safe access for bicycles and pedestrians to city amenities and schools as well as outlying
recreation areas. The proposed trail system will provide access to schools, Western State
College, city parks, the Community Center, the Gunnison River, and the Hartman Rocks
Recreation Area from all points within the city limits. Residents in unincorporated subdivisions
will have safe access to town and the schools and non-motorized travelers will benefit from
separated highway crossings. The BRIDGE TO BRIDGE project will improve accessibility and
connectivity for all points from three miles north of town to three miles south of town.
Following passage of a bond issue dedicating a sales tax base for development of the trails
system, a Request for Proposals (RFP) was issued and Recreation Engineering and Planning
consultants (REP) were retained to develop a phased implementation strategy prioritizing various
segments of the trails system based upon the social and economic benefits provided, land
availability, and funding. A Colorado State Trails Grant was secured to fund development of the
Trails Master Plan. The adopted Gunnison Trails Master Plan (2008) is available for view at
the city of Gunnison web-site, under City Departments, Parks and Recreation
Planning for a trails system did not begin with the passage of the bond initiative in 2007. The
1997 Three Mile Plan, the Update to the Transportation Element of the City Master Plan (2000),
and the City of Gunnison Master Plan, adopted April 25, 2007, contain several goals and policies
related to development of a trails system. The West Gunnison Neighborhood Phase I Initial Plan
contains a Transportation Opportunities and Constraints Map suggesting an alignment providing
greater access to neighborhood services, employment opportunities and outdoor recreation.
In July and August 2007 public meetings were held to provide opportunities for stakeholders and
the public to review and comment on various options for trail alignment. The Bureau of Land
Management, United States Forest Service, Colorado Division of Wildlife, National Park
Service, and County Airport were all involved participants. The Gunnison County Trails
Commission and Gunnison Nordic Council were, and continue to be, involved in the plan
Following the public meetings the consultants and City staff conducted fieldwork and research to
determine the delineation of the Outer Loop, which will connect multiple City-owned parcels,
the college, Gunnison County, public schools, and the proposed Gunnison Rising annexation.
The consultant’s recommendations provide basic alignment information to include a
recommendation to use existing river bridge structures to establish separated non-motorized
crossings of the related highways. At this point the city staff intuitively feels that the utilization
of the bridge structures is the most cost effective means to accomplish the crossings, but the city
is open to alternative means to develop safe highway crossings if cost savings can be
accomplished. The remainder of this RFP will focus on the bridge underpass designs.
3.0 PRELIMINARY SCOPE OF WORK
The City is in the initial scoping process for development of construction-level engineer plans for
the underpasses at the bridges crossing the Gunnison River on Highway 135 north of the city and
on Highway 50 southwest of the city. The Colorado Department of Transportation (CDOT)
requires a License Agreement to construct these underpasses. The License Agreement requires
CDOT review of construction level engineering designs. In the interim, the City has received a
letter of support from CDOT for the project, but the permitting element is contingent upon
engineering plan detail.
The City, under a separate contract, is in the process of developing a site survey of the underpass
areas to include adjacent property boundaries, two-foot contour data, and elevation datum for the
bridge structures. Site survey data will be prepared in an AutoCad file format and will be
provided to the selected engineer for this project. The City has also initiated field work to
identify jurisdictional wetlands affected by the underpass construction. Permitting requirements
under Section 404 of the Clean Water Act will be handled by the city under a separate contract
with the project wetland consultant.
The initial thought is to construct the underpass facilities so they would not be inundated during
a 10-year flood event or high water from a typical spring runoff. However, there will be times
when the underpass structures
would be inundated, and they would
have to convey flows in a manner
that will not affect Base Flood
discharge. It is anticipated that
hydrologic and hydraulic analyses
must be established to demonstrate
that any structures in the proposed
encroachments will not result in any
increase in flood levels within the
community during the occurrences
of Base Flood discharge (44CFR
Design considerations will be
utilized that minimize maintenance
requirements through proper drainage, access, construction, stabilization, and location.
3.02 Conceptual Description
At the TWIN BRIDGES SEGMENT appriximately 300 ft. concrete ramp and underpass will be
constructed on the east side of the Gunnison River under the bridge on Highway 50, providing
safe access without crossing the highway. On the south side of the highway bridge a 170 ft. steel
pedestrian/bicycle bridge will be constructed over the river, providing access to the Whitewater
Park and a connection to other sections of the Outer Loop and to the Hartman Rocks Recreation
Area. On the east side of the river, between Highway 50 and the frontage road, connecting to the
concrete ramp, will be a 350 ft., 10-12 feet wide, soft surface detached trail. A
Pedestrian/Bicycle License Agreement is being developed with the Colorado Department of
Transportation for construction of the trail segments within CDOT rights-of-way.
The Highway 50 Bridge is a steel I-beam structure with three segments. Two bearing structures
are located in the river channel to support the bridge center span segments. The embankment
structure is a concrete grade beam bearing on two concrete piers. Electrical lines and a gas line
are attached to the bridge facility. The bridge embankment is lined with large rip-rap to protect
from channel erosion. As noted by the image, vertical clearance will be a challenge; an eight
foot clearance is desirable but may not be achievable without significant excavation. The
underpass facility will require adequate design to maintain the embankment structural integrity
from erosion forces. More images of the bridge structure are provided in Appendix 1.
The UNDERPASS AT NORTH BRIDGE will be the other link of the BRIDGE TO BRIDGE project.
It will be approximately 375 feet long, 10-12 feet wide concrete ramp and underpass under the
Highway 135 Bridge that crosses the Gunnison River. On the west side of the highway a ±220
ft. pedestrian/bicycle bridge will be constructed over the river, providing access to the rafter boat
launch site. This proposed bridge is being
constructed by Gunnison County and it is
likely that the final engineering contract will
include the County’s bridge design, but final
agreement details between the City and County
have not be completed.
The existing Highway 135 bridge structure is
also a three-segment steel I-beam design with
two bearing supports in the channel carrying
the center spans. The concrete support
structure at the channel embankment is a
continuous grade beam. It is likely that a
continuous footer is located at the base of the grade beam, but the structure’s base is not exposed.
The Highway 135 Bridge has natural gas lines on both the east and west side of the bridge and
those lines are attached to the bridge platform. Height separation under the Highway 135 bridge
is not an issue, but the highway ROW width and grade change on the east side of the river will
present a design challenge. Engineering plans for both bridge structures are being provided to
the City from CDOT and those plans will be made available to the firm chosen for this project.
3.03 Basic Design Elements
As previously noted there are no preliminary concepts for the underpass designs. A review of
similar designs in other communities indicates two types of design may be applied for the Bridge
to Bridge project. One type of design is a raised platform established along the embankment.
The other design is a concrete stem wall used to divert channel flow.
The firm selected for this project will also be responsible for the engineering design of a non-
motorized bridge spanning the Gunnison River at the Twin Bridges. The bridge design shall be
completed in a manner as to minimize channel disturbance. The initial thought has been to
develop a clear-span structure, but final cost, function and durability will be used to determine
As previously noted Gunnison County is also working to develop another non-motorized bridge
structure at the North Bridge site. The County has not started engineering or permitting process
and has expressed interest in working with the city on the design under this RFP and contract. It
is anticipated that City and County will work on a joint engineer design program but final
agreement details still need to be worked out. It is requested that RFP respondents provide
project cost estimates to include the County’s addendum work.
All final drawing sets shall include the engineer of record stamp. Engineered plans will likely
include, but not be limited to, the following:
• Geotechnical soils investigation as necessary to obtain adequate data to complete civil
• plan view drawings;
• grading and drainage plan;
• trail profile drawings;
• typical trail sections;
• elevations depicting the bridge structure in relation to trail surface;
• specifications for structural fill;
• bases coarse depth;
• concrete slab specification;
• details of specific features;
• detailed project cost projection along with specific material list;
• material specifications; and,
• other narrative and drawings as need to provide for successful project construction.
Design details will include the underpass approach, facilities within river embankment, retaining
walls for underpass approach areas, erosion control elements, and other features as determined
by the design program. Facilities shall be sufficient to maintain structural competency when
subjected to the hydraulic forces of the river and shall not affect the structural integrity of the
CDOT bridge facilities. All engineer plans for facilities in the CDOT rights-of-way may need to
be designed in accordance with CDOT related specifications. The initial thought is that the
underpass structures will be designed to be operational during a 10-year Flood Event, but will be
designed to convey flows from a Base Flood event without increase of the flood elevation.
Additionally, the underpass and bridge should be ADA accessible.
The scope of work must include the costs required for the on-site construction supervision of the
project during critical construction period. The City shall have the final determination if the
contract will include on-site supervision of the construction activity.
In regard to existing soil, the materials found in at the two sites are typical of those found in a
mountainous river. Alluvial material from cobble to silt and clay size material are typical. It is
very unlikely that any expansive soil conditions will be found on the site.
Both bridges are located outside the city limits. Gunnison County participates in the National
Flood Insurance Program (NFIP). Underpass structures will be located in the designated A Zone
and will impede into the designated Floodway. Based on 44 CFR 60.3(d), construction of the
underpasses will require an encroachment review, and will be subject to an Encroachment
Certification based on FEMA protocol. Therefore, the project engineer shall be required to
develop hydrologic and hydraulic data of sufficient detail to obtain the NFIP Encroachment
4.0 QUALIFICATIONS & DELIVERABLES
The firm selected shall demonstrate the ability and expertise to address the civil engineering
design for a project of this nature being within a Floodway. Additionally the consulting firm
shall have the ability to work with CDOT to ensure that designs are in accordance with all
CDOT related specifications. At a minimum the firm shall have specific expertise in civil
engineering, hydrology, fluvial geomorphology, and riverine hydraulics. The selected firm shall
have competent staff, including Professional Engineers registered by the State of Colorado.
The project will be split into a two-part review; preliminary design and final design. Deliverable
documents shall include, but not be limited to, all of the following:
• ten copies of the construction-level drawings on 24” x 36” paper;
• ten copies of construction manuals, details and other related narrative data;
• two DVDs containing AutoCad drawings of all of the drawing pages;
• five copies of reports, plan specifications, data and other related information to obtain FEMA
• two DVD’s of FEMA-related information; and,
• signed permits as necessary from FEMA, the State of Colorado, and Gunnison County
5.0 REQUIRED RFP SUBMITTALS
Submittals shall clearly demonstrate the consultant’s ability to provide the services as outlined in
this RFP. The proposal shall contain the following:
Cover Letter: A cover letter shall be provided which succinctly explains the consultant’s interest
in the project. The letter shall contain the name, address, and telephone number of the firm’s
Principal contact and shall identify individuals who will be making the presentation on behalf of
the firm. The statement shall bear the signature of the person having proper authority to make
formal commitment on behalf of the firm.
Qualifications: of Key Personnel: Submit résumés of all those who will be involved in
completing the Scope of Work (SOW). Please include their experience in performing the
required and necessary services. The project personnel must have completed two contracts of
the same size and scope within the past five years.
Firm Experience: Submittals will include a detailed description of the firm’s overall
capabilities, experience and approach in providing the SOW described herein.
Cost Estimates: Submittals will include cost estimates for the complete project design and
engineering services. Specifically, the projected costs will include engineering fees for elements:
1. design fees for the pedestrian underpass facilities;
2. design fees for the pedestrian bridge design to the Whitewater Park;
3. design fees for the County’s pedestrian bridge on Highway 135 at the north bridge;
4. fees to complete FEMA permitting requirements;
5. fees for geotechnical investigation and soils report;
4. fees required for construction inspection at critical path points of the project; and
5. cost estimates for any alternative structure that provides separated non-motorized access
across the highways.
References: Provide at least four references for projects of similar size and scope, including at
least two references for projects completed during the past two years. Include the client’s name,
a brief summary of the work, and the name and telephone number of a responsible contact
Financial Statement: Provide a financial statement or some other means to demonstrate and
confirm the financial stability of the business and its capacity to undertake this project.
Proposal: A summary presentation will be given by applicants. The audience will be City Staff,
and certain City Council and Planning and Zoning Commission members.
Additional Information: Provide any additional information that will aid in evaluation of the
consultant’s qualification with respect to this project.
6.0 SELECTION PROCESS
The City of Gunnison, at its sole discretion, shall determine whether particular consultants have
the best qualifications and proposal to complete the project.
City staff will make a recommendation to the City Council regarding this selection. The City
reserves the right to reject any and all submittals. The following will be used to evaluate the
Qualifications of Key Personnel: The knowledge and experience of the identified personnel
is directly related to the needs of the project.
Firm Experience: The team has a demonstrated track record of a similar size and scope
project, with the overall capability and experience to complete the project.
Team Composition: The respondent has assembled a team that has expertise in
planning/design, economics, demographic assessment and transportation planning. The
respondent must demonstrate the ability to work in an open public process of this nature, as
well as coordinating with municipal staff and the applicant in a joint effort that will result in
the successful outcome of this project.
Critique of the Draft Scope of Work: The presentation shall include a critique of the Draft
Project Scope of Work with recommendations for strengthening and/or improving the
efficiency of the SOW.
Projected Costs: The presentation materials shall include projected costs for the professional
planning and facilitation services associated with the project.
Quality of Presentation: The presentation is professional, thorough and adequately conveys
the firm’s ability to be part of the team bringing forth a successful project.
7.0 PRE-SUBMITTAL SITE VISIT AND MEETING
At 1:00PM on October 27, 2008 the City will host a pre-submittal site visit and meeting. It is not
mandatory to attend the meeting. City staff will discuss the project details, answer questions and
conduct a site visit to the bridge sites.
8.0 SUBMISSION INFORMATION & DEADLINE
Submittal Address. Responses with all deliverables shall be mailed or delivered to:
City of Gunnison
Community Development Department
Attn: Mr. Steven Westbay
PO Box 239
Gunnison, CO 81230
The original and 10 copies of the response shall be mailed or delivered in a sealed package with
the following information clearly delineated on the outside of the package:
RFP – Engineering for the BRIDGE TO BRIDGE Underpass Project
Responses Due: November 12, 2008
Close of Business: 5:00 P.M.
9.0 GENERAL TERMS AND CONDITIONS
9.0.1 Late Responses
Responses received after the time and date specified, whether delivered or mailed, will not be
considered and will be returned unopened. It is the sole responsibility of each respondent to
ensure that their submittals arrive at the City Community Development Department prior to the
time and date specified.
9.0.2 Rejection of Submittals
The City reserves the right to accept or reject any or all submittals received in response to this
solicitation. The City further reserves the right to waive any informalities and/or minor
irregularities in submittals received, if deemed to be in the best interest of the City.
9.0.3 Proprietary Information
All submittals in response to this request become public record and become subject to public
inspection. Any confidential information contained in the submittals must be clearly identified as
such or it will not be treated as confidential or proprietary by the City and then only to the extent
allowable by law in the Open Records Act. Unrestricted disclosure of propriety or confidential
information submitted by any consulting firm in an RFP response places it in the public domain.
Proprietary or confidential information is defined by the City to be any information that is not
generally known to competitors and which may provide a competitive advantage. Submittals in
their entirety cannot be specified confidential or proprietary.
9.0.4 Submittal Ownership
All materials submitted with regard to this solicitation become the property of the City and will
only be returned at the City’s option. The city shall have the right to use all ideas or adaptations
of the ideas contained in proposals received, subject to the confidential or proprietary limitation
contained herein. Disqualification of any document does not restrict or eliminate this right.
Expenses incurred in preparation, submission, and presentation of this RFP is the responsibility
of the company and cannot be charged to the City.
9.0.6 Sovereign Immunity
The City of Gunnison specifically reserves its right to sovereign immunity pursuant to Colorado
State Law as a defense to any action arising in conjunction to this agreement.
The laws of the State of Colorado, County of Gunnison, and City of Gunnison, with any Rules
and Regulations issued, prevail with regard to any contract documents, possible terms and
conditions disagreements, arbitration, or litigation.
9.0.8 Compliance with Laws
All proposals must comply with applicable federal, state, county and city laws governing this
procurement. Note that the consultant must comply with provisions of Colorado House Bill
1323 as it may be applicable.
Amendments to this RFP may be issued at any time prior to the time set for receipt of proposals.
9.0.10 Oral Statements
Oral statements by representatives of the City or the responding company shall not modify or
otherwise affect the terms, conditions, or specifications stated in this document. All modification
to this request must be made in writing.
9.0.11 Conflict of Interest
No City official and/or employee shall have interest in any contract resulting from this RFP.
9.0.12 Insurance Requirements
The selected consulting firm will be required to provide, at their own expense, without cost to the
City, the following minimum insurance:
General Conditions: Policies of insurance shall be written by companies authorized to write
such insurance in Colorado.
General Liability & Automobile Insurance: During the life of the contract a comprehensive
general liability and automobile insurance policy with liability limits in amounts not less than
$600,000 per incident and $150,000 per person. Said polices of insurance shall include
coverage for all operations performed for the City by the contractor; coverage for the use of
all owned, non-owned, or hired automobiles, vehicles and other equipment both on and off
work, and contractual liability coverage shall specifically insure the hold harmless provision
in favor of the City.
Worker’s Compensation Insurance: The contractor shall comply with the provisions of the
Worker’s Compensation Act.
The selected consulting firm shall defend, indemnify and save harmless the City of Gunnison,
State of Colorado, and all its officers, employees, insurers, and self-insurance pool, from and
against all liability, suits, actions, or other claims of any character, name and description brought
for or on account of any injuries or damages received or sustained by any person, persons, or
property on account of any negligent act or fault of the selected consultant, or of any consultant's
agents, employees, sub-consultants or suppliers in the execution of, or performance under, any
contract which may result from the proposal award. The selected consulting firm shall pay any
judgment with cost which may be obtained against the City growing out of such injury or
Appendix I – Images of Existing Bridge Structures
Figure 1 Twin Bridge Embankment Structure Figure 2 Twin Bridge Embankment Structure
Figure 3 Twin Bridges erosion control and Figure 4 Twin Bridges north approach
approximate alignment between Frontage Road
Figure 5 Twin Bridges south of Highway 50 Figure 6 HWY 135 approximate path alignment
Figure 8 HWY 135 Bridge east side approach
Figure 7 HWY 135 Bridge looking upstream,
Figure 7 HWY 135 Bridge west side approach