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Pierce County Upper Nisqually Protection & Stabilization Project
1. Mount Rainier National Park โ
Upper Nisqually Protection and
Stabilization Project
Ingo Kuchta - Project Manager/Engineer
Brian Bennett - Engineer
Marty Ereth - Biologist
Rob Wenman - Planner
Pierce County Surface Water Management
November 17, 2017
..
2. Problem Statement: Reoccurring damage to the existing levee
structure during high flows.
โ Location โ Nisqually River: Right Bank
(near Nisqually gate main entrance to Mt. Rainier National Park)
โ What is at Risk? โ Mount Rainier National Park access and
utility infrastructure. Nisqually Park Subdivision
โ Proposed Project or Action - Construct a series of 28 rock
deflectors
Project Overview
11/17/2017 MRNPโ Upper Nisqually Protection and Stabilization Project
3. Why is protection and stabilization necessary?
๏To protect critical infrastructure and maintain access to the
Mount Rainier National Park
๏Protect the Nisqually Park Subdivision downstream
๏Substantially reduce reoccurring repair costs associated
with damaging floods
Project Overview
MRNPโ Upper Nisqually Protection and Stabilization Project11/17/2017
4. Maintenance Costs
11/17/2017
Note:
Costs do not factor in
todayโs costs
MRNPโ Upper Nisqually Protection and Stabilization Project
YEAR PIERCE COUNTY USACE
1991 $ 74,610
1992 $142,718
1993 $217,000
1995 $ 50,000* $200,000
1996 $ 50,000* $200,000
2003 $122,500
2004 $203,000
2005 $131,000
2006 $900,760
2010 $529,500
2011 $185,629* $752,529
2012 $652,655
2017 $243,440* 973,800
Subtotal $3502,812 $2,126,329
TOTAL $5,629,141
* County share is typically min. 20% of total cost
Levee/Revetment
Repair Costs
Since 1990
5. Reach Characterization โ Glacial Fed
MRNPโ Upper Nisqually Protection and Stabilization Project11/17/2017
Project
Site
6. Reach Characterization - continued
11/17/2017
โข Contributing basin is 65 square miles
โข Mostly within Mt. Rainier National Park
โข Relatively undeveloped
โข 80 inches of rain annually (avg.)
โข Short duration runoff/steep gradient
โข Large amounts of sediment transport
โข Sediment drives channel thalweg.
MRNPโ Upper Nisqually Protection and Stabilization Project
8. Reach Characterization - continued
MRNPโ Upper Nisqually Protection and Stabilization Project11/17/2017
Braided river
channel
High bench
terraced
floodplain
Lahar deposit/
old growth
forest
Levee
structure
Mt. Rainier
National Park
Sunshine Point
Campground
16. 2006 flood event
11/17/2017
โข Sunshine Point Campground and entrance road to Mt Rainier
National Park washed out.
โข Major damage to roadways, buildings and infrastructure.
MRNPโ Upper Nisqually Protection and Stabilization Project
Source: MNRP
25. ELJ Proposed Alternative
11/17/2017
โข Construct a series instream engineered logjam structures (ELJ)
to encourage sediment deposition in the washout area and
lower water velocities. Additional deflector structures could
be built along the revetment face as part of a second phase.
โข Desired effect was to encourage the thalweg to move away
from the revetment.
โข Reduce water velocity around the logjam and revetment face
encouraging sediment deposition.
MRNPโ Upper Nisqually Protection and Stabilization Project