Lake Cunningham Shoreline and
Water Quality Study
Neighborhood Services and Education Committee
December 8, 2022
Presented by:
Sara Sellers, Interim Deputy Director, [email protected] 1 Lake Cunningham
Master Plan
• Guided development
of flood detention
basin; and
• Recreational facility.
2 3
Shoreline and Water
Quality Study
Analysis:
• Water Quality
• Water Sources
• Water Quality
Recommendations
• Shoreline Erosion
• Rough Order of
Magnitude
Construction Costs
4 Water Quality Issues are
primarily from:
• Physicochemical Parameters:
Increased lake water temperatures
and thermal stratification.
• Geochemical Parameters: Elevated
pH levels.
• Trophic Parameters: Increased levels
of nitrogen and phosphorus which
contribute to increased algae
growth.
• Pathogens: Increased fecal bacteria.
5 Alternative 1:
Internal Treatments
and Focused Park
Improvements
• Algaecide treatments
• Treatment of lakebed sediments
• Turf replacement
• Fertilizer reduction
• Bioswale implementation
Construction Rough Order of
Magnitude:
• $1.2M to $1.8M
• Excludes City soft costs, consultant
fees and hardcost contingency
RECOMMENDATIONS
6 Alternative 2:
Internal Treatments, Focused Park
Improvements, Path Stabilization, and
Shoreline Wetlands
• Builds on Alternative 1;
• Regrade northeastern hills;
• Relocate shoreline path;
• Create wetland bench along shoreline;
• Plant riparian and upland trees.
Construction Rough Order of Magnitude:
• $5M to $9M for 10 acres of shoreline
wetland;
• $12M to $20M for 17.5 acres of shoreline
wetland;
• Excludes City soft costs, consultant fees,
and hardcost contingency.
7 Alternative 3:
Internal Treatments, Focused Park Improvements,
Path Stabilization, Shoreline Wetlands, and Big
Meadow Wetland Enhancement
• Builds off Alternative 1 and 2;
• Construct flow-through wetland in Big
Meadow.
Construction Rough Order of Magnitude:
• $5M to $9M for 10 acres of shoreline wetland;
• $12M to $20M for 17.5 acres of shoreline
wetland;
• $3M to $5M for concurrent 19-acre Big
Meadow wetland
• Excludes City soft costs, consultant fees, and
hardcost contingency.
8 Water Contact
Recreation
Internal Treatments, Focused Park Improvements,
Path Stabilization, Shoreline Wetlands, Tree
Plantings, andBig Meadow Wetland
Enhancement
• Similar to Alternative 3
• “Lowest cost project” that could achieve a
water quality that allows for recreation
activities to occur at the lake
Construction Rough Order of Magnitude:
• $27M
• Extremely conceptual cost estimate not
guaranteed $27M would provide the
necessary water quality changes to
achieve recreational uses.
8 Conclusion
• Staff will continue to work
with Consultant to conduct
further water quality tests,
refine cost estimates, and
establish a recommended
phasing approach.
9 Lake Cunningham Shoreline
and Water Quality Study
Neighborhood Services and Education Committee
December 8, 2022
Presented by:
Sara Sellers, Interim Deputy Director, [email protected] 10