- Development of the subwatershed has
resulted in increased stormwater volumes and flow peaks and reduced
infiltration and base flow in Minnehaha Creek. Development, redevelopment, and
reconstruction in the subwatershed may provide opportunities to decrease
stormwater runoff volumes and increase infiltration.
- Ongoing flow monitoring in Minnehaha
Creek suggests that some reaches of the creek are losing flow to
groundwater, possibly contributing to periods of low or intermittent flow.
- Seeps and springs are present in the
subwatershed, mainly in the limestone cliffs of the Gorge. The most prominent spring is Camp
Coldwater Spring. Hydrologic
analysis and monitoring conducted at the time the Minnesota Department of
Transportation proposed to construct a new highway interchange nearby
indicate this historic spring is sensitive to impacts in its
- The extensive wetlands in the upper subwatershed
were identified in the FAW as either discharge wetlands or combination
recharge-discharge wetlands. It
will be critical to maintain or increase infiltration rates in the upper
subwatershed to help maintain hydrology to these wetlands. Wetlands in the lower subwatershed are
mainly recharge or combination wetlands.
The hydrology of these wetlands depends on maintaining local flow
patterns and rates.
- Much of the subwatershed is very
highly or highly sensitive to aquifer impacts, including the Minnehaha
- Wellhead Protection Areas have been
identified for the cities of Edina, Minnetonka and St.
Louis Park within this subwatershed. Stormwater management within those areas
should be coordinated with wellhead protection plans.