Agenda Date: 02/06/2018
Subject:
Title
A resolution authorizing a 3rd Amendment to an Intergovernmental Agreement between the City of Littleton and the Urban Drainage and Flood Control District for Stream Stabilization Improvements on Jackass Gulch
Body
Presented By:
Keith Reester, Public Works Director
POLICY QUESTION:
Does city council approve an amendment to Intergovernmental Agreement 14-05.06 to commit additional funds to continue construction of improvements on Jackass Gulch?
BACKGROUND:
Jackass Gulch is a natural stream running along the north side of West Mineral Avenue, from the High Line Canal to the railroad corridor. West of the railroad corridor the drainage way is contained in a storm sewer pipe, which outlets in the South Platte Park and drains to the South Platte River, south of the West Mineral Avenue bridge.
In 2014, the Urban Drainage and Flood Control District (UDFCD) and City of Littleton entered into an Intergovernmental Agreement (IGA) 14-05.06 to begin the design and construction for the stabilization of a portion of Jackass Gulch, located behind the residential properties along West Jamison Way, upstream of Jackass Hill Road. This reach was determined to be most urgent, with residential properties at risk of collapse from migrating eroding channel banks.
In 2017, construction began on stream enhancement of the South Platte River in South Platte Park, downstream of West Mineral Avenue. The work created a natural appearance low flow channel, gravel bars, riffles, pools, glides, bank stabilization and planting areas. There is concern these river improvements may be jeopardized by relatively high volumes of sediment entering the river from erosion along Jackass Gulch.
Prior council action in 2017 amended the IGA with UDFCD to expedite the project in 2017 and 2018, and thereby make the improvements along Jackass Gulch to protect the adjacent properties as well as the downstream improvements along the South Platte Park. This pr...
Click here for full text