work underway on a water-discharge structure we designed for poor soil conditions
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Valley Creek stream stabilization

Valley Creek stream stabilization

stabilized channel restores flow of trout stream

A degraded, 2,200-foot channel reach on Valley Creek was badly incised in the sandy soils. Although a landowner had cleared much of the buckthorn, the remaining vegetation quality was poor. The watershed district brought in Barr for evaluation and design services.

We performed a feasibility study to identify stabilization stream options, which were review by the watershed district and the Minnesota Department of Natural Resources. The selected option included a combination of boulder riffles to raise the channel bottom and excavation of floodplain terraces to reconnect the stream to the floodplain.

We used hydraulic modeling to size materials properly and designed eight boulder riffles, which improve passage for trout in the stream and dissipate the energy of flowing water to reduce downstream erosion. Approximately 4,500 cubic yards of material was excavated from the overbanks to create floodplain terraces inside of the meander bends. The design called for the installation of 45 root wads to stabilize eroding banks, and placement of 6,000 feet of biolog along the bank toes, with an erosion-control blanket protecting the upper stream banks. The banks and floodplain terraces were then seeded with native grasses.