This document summarizes the management of a shallow lake from 2008 to 2013. Key issues included invasive species, water clarity, muck, water quality/pollution, and water levels. Water quality showed improvements from 2008-2012 in metrics like phosphorus and clarity. Invasive aquatic plants remained a challenge. Future plans included continued monitoring, updating management plans, studying groundwater impacts, and assessing the lake berm.

1. 2008 to 2013

2. Agenda
Review Planning & Management Approach
Review the Issues and What’s Been Done
Review the Current Issues
Things in the works
Questions

3. Identified Issues on 3/25/08
Milfoil, weeds, invasive spp.
Water Clarity
Muck
Water Quality/Nonpoint
pollution
Water Level
Garbage & Trash

5. 2007
Concern
Shallow Lake ‘Switches’
Clearwater State Turbid State
Large aquatic plant community Low aquatic plant productivity
Low algal productivity High algal productivity
Large grazer population Low grazer productivity
(zooplankton)

6. Clear scientific understanding of switch into
turbid state
Unclear understanding of
reverse switch back to healthy water quality

7. 1. Invasive Species Strategy

8. 2. Trends in Water Clarity

9. 3. Muck
Not an Issue that
can be
addressed

10. Muck
Nature of shallow lake
Boat channel excavated
in 2008
Requires permit from
state – contrary to
fishery objectives

11. 4. Non-Point Source Pollution
Activity 2009 2010 2011 2012
Water Quality
Monitoring (9.16)
* * *
Buffer Strips
(9.05)
2 ? ?
Rain Gardens 3
(9.06)
Inspect Ponds
(9.12) * *

12. 4. Water Quality

13. Nonpoint Source Pollution/
Stormwater Management
Objective Goal 1990-2006 2008-2012
Avg Avg
Total Phosphorus 40 ug/L 30 ug/L 27.9 ug/L
(TP)
Chlorophyll-a <15 ug/L 11.6 ug/L 6.6 ug/L
Secchi Disk > 6 ft 5.3 ft 8.4 ft
Transparency
Dissolved Oxygen 5 mg/L daily avg 8.5 mg/L daily 6.9 mg/L
(DO)
Treatment of 1 – 2 Buffer strips <1 0
32% of direct established each
discharge year

14. 5. Garbage & Trash
Activity 2009 2010 2011 2012
Enforcement Blitz * * * *
Increase Garbage * * * *
Pick up
More Garbage Cans * * * *

15. 6. Water Level Trends

16. 6. Water Level Needs
Know groundwater issues
Follow development of County Geologic Atlas
Follow City and State groundwater appropriation
to the Northeast of the Lake (Supply side)
Conserve water
INFILTRATE! Soak It In!

17. Conclusions
Water quality is very good
Noticeable improvements occurred in 2011 and 2012
Invasive aquatic plants continue to be a challenge
Effects of groundwater on Lake levels is a concern

18. CCWD Plans & Actions
Annual
Monitoring
Lake Level
Lake Water Quality
Lake Vegetation Management
Inspections
Lake Outlet & Dam
Grant availability
Demonstration
Education

19. Next 3 Years
Lake Vegetation Management Plan
2013 Update Lake Management Plan
Develop Aquatic Invasive Species Plan
Groundwater - Surface Water Study
2014
Update Stormwater Management Plan
Watershed Restoration and Protection
Plan (TMDL)
2015 Assess berm for Repairs