5.8.9 Other Projects

This Plan identified the need to consider additional projects not included in the prioritized 2007-2017 CIP. These include regional infiltration opportunities in subwatershed units MC-140, 147, and 151 (see Section 5.8.5 above); four priority reaches of Minnehaha Creek as noted above; and dredging Longfellow Lagoon to remove accumulated fine sediments. The Board may consider such projects during the time frame of this Plan if funds are available.

ProjectLongfellow Lagoon Dredging
DescriptionDredging fine sediment accumulated in the Longfellow Lagoon impoundment
NeedThe Stream Assessment identified a sediment delta in Longfellow Lagoon. Fine sediments drop out and accumulate in this impoundment. To preserve channel conveyance and improve aesthetics, consideration should be given to dredging the lagoon.
OutcomeImproved aesthetics, habitat, and water quality
Estimated Cost and FundingDesign, construction, project management. Funding source for this project is the District capital levy.$114,100
ScheduleOne Year Prior to Construction: Design, cooperative agreementNo Year Assigned: Construction of stream restoration

 

ProjectReach 2 Restoration
DescriptionStreambank restoration, buffer reestablishment, enhancement of in-stream habitat features
NeedThis reach extends from just above Minnehaha Falls to the Hiawatha Avenue weir. It contains a few streambank erosion sites and locations where retaining walls have failed. Fish spawning habitat is poor as fine sediment is deposited behind the weir in the Longfellow Lagoon. The riparian corridor is poor or nonexistent and in need of improvement. The reach scored a 4.3 on the Stream Visual Assessment Protocol index evaluated as part of the Minnehaha Creek Stream Assessment. The project would focus on improving the streambank stability and quality of the riparian area through bioengineering and native vegetation plantings as well as installation of in-stream habitat features.
OutcomeStabilized streambanks with both hard armoring and bioengineering to reduce erosion; improved riparian zone with native vegetation; improved fish and macroinvertebrate habitat; improvement in SVAP index to a score greater than 5.0.
Estimated Cost and FundingDesign, construction, project management, vegetation management contract. Funding source for this project is the District capital levy.$190,200
ScheduleOne Year Prior to Construction: Design, cooperative agreementNo Year Assigned: Construction of stream restoration
ProjectReach 11 Restoration
DescriptionStreambank restoration, buffer reestablishment, enhancement of in-stream habitat features
NeedThis reach extends from Lyndale Avenue to Logan Avenue S. It contains storm sewer outfalls that require repair or improvement, and unpaved trails on the right bank that may exacerbate erosion. The riparian corridor is a mix of turf grass maintained to an eroding creek edge and stable banks with riparian tree and shrub growth. The reach scored a 5.7 on the Stream Visual Assessment Protocol index evaluated as part of the Minnehaha Creek Stream Assessment, mainly due lack of in-stream fish and invertebrate habitat. The project would focus on improving the streambank stability and quality of the riparian area through bioengineering and native vegetation plantings as well as installation of in-stream habitat features.
OutcomeStabilized streambanks with both hard armoring and bioengineering to reduce erosion; improved riparian zone with native vegetation; improved fish and macroinvertebrate habitat; improvement in SVAP index to a score greater than 6.0.
Estimated Cost and FundingDesign, construction, project management, vegetation management contract. Funding source for this project is the District capital levy.$1,179,500
Schedule

One Year Prior to Construction: Design, cooperative agreement

No Year Assigned: Construction of stream restoration

ProjectReach 18 Restoration
DescriptionStreambank restoration, buffer reestablishment, enhancement of in-stream habitat features
NeedThis reach extends from West 44th Street to Soo Line Railroad Bridge. The riparian corridor is a mix of turf grass maintained to an eroding creek edge and stable banks with riparian tree and shrub growth. Establishing native vegetation on streambanks and in buffers would help stabilize eroding streambanks. The reach scored a 6.2 on the Stream Visual Assessment Protocol index evaluated as part of the Minnehaha Creek Stream Assessment, mainly due to lack of in-stream fish and invertebrate habitat and poor riparian conditions. The project would evaluate the replacement of existing 44th Street bridge grade control riffle would restore the stream to a more free-flowing condition.
OutcomeStabilized streambanks with both hard armoring and bioengineering to reduce erosion; improved riparian zone with native vegetation; improved fish and macroinvertebrate habitat; improvement in SVAP index to a score greater than 7.0.
Estimated Cost and FundingDesign, construction, project management, vegetation management contract. Funding source for this project is the District capital levy.$443,900
Schedule

One Year Prior to Construction: Design, cooperative agreement

No Year Assigned: Construction of stream restoration

ProjectReach 29 Restoration
DescriptionStreambank restoration, buffer reestablishment, enhancement of in-stream habitat features
NeedThis reach extends from Bridge Street to the I-494 west off ramp. The riparian corridor is a mix of turf grass maintained to an eroding creek edge and stable banks with riparian tree and shrub growth. Invasive species dominate the riparian zone. Invasive species should be eradicated and native riparian cover established or enhanced throughout the reach. The reach scored a 4.8 on the Stream Visual Assessment Protocol index evaluated as part of the Minnehaha Creek Stream Assessment, mainly due to lack of in-stream fish and invertebrate habitat. Meander reconstruction could improve stream complexity and improve in-stream habitat conditions.
OutcomeStabilized streambanks with both hard armoring and bioengineering to reduce erosion; improved riparian zone with native vegetation; improved fish and macroinvertebrate habitat; improvement in SVAP index to a score greater than 6.0.
Estimated Cost and FundingDesign, construction, project management, vegetation management contract. Funding source for this project is the District capital levy.$862,400
Schedule

One Year Prior to Construction: Design, cooperative agreement

No Year Assigned: Construction of stream restoration