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Palouse-Clearwater Environmental Institute

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Bridge Street Park Streambank Stabilization and Riparian Planting

bridgeafterWatershed: Palouse Basin
Stream Name: Paradise Creek
Date Established: 06/19/2001
Project Status: Complete

 

Description

The main purpose of this project was to reconfigure approximately 450 linear feet of a straight, ditch-like creek to a low flow channel with a terraced floodplain. Approximately 390 cubic yards were excavated from this site. The newly constructed low flow channel was a 3 to 4 foot bottom width, compared to the old width of 8 foot. Approximately 195 cubic yards of the 390 cubic yards were used as backfilled to create the two-tiered floodplain. From the creek’s west side streambank the floodplain extends 20 feet back with each terrace being about 6 feet in width and a foot in height. To create these terraces the excavator constructed soil wraps out of erosion control blankets and some of the excavated material, while the Palouse-Clearwater Environmental Institute staff and AmeriCorps*NCCC members secured these soil wraps in place.

Previous Conditions

The previous site conditions of this stream segment were characterized by slumping, eroding streambanks that were frequently undercut during heavy storm events. In addition, the creek was regularly dredged, creating a far too wide low flow channel. Reed canary grass was the dominant vegetation along this stream segment. Few trees or woody vegetation grew along the stream segment because mowing was conducted up to the edge of the streambank.

Photo History:

bridgebeforene061801Bridge Before NE 06/18/01: Highlighted in this photograph are the previously existing site conditions before excavation began. Worth noting is the channel’s width and dominance of reed canary grass along the streambank.

bridge1stwrapne061901Bridge 1st Wrap NE 06/19/01: The first step in the implementation process of the soil wraps was the need to drain the water out of this reach of the creek. Once completed, the first soil wrap could be installed within the channel.

bridge2ndwrapne062001Bridge 2nd Wrap NE 06/20/01: Taken from the same location as the previous two photographs, the first soil wrap has been installed and the second wrap is in the process of being constructed.

bridgereslopingne062001Bridge Resloping NE 06/20/01: This photograph was taken in the same location as the previous three photographs. The excavator has just finishing resloping the upper bank. This is the final stage of the construction.

bridge2ndwecbsn061901Bridge 2nd w ECBs N 06/19/01: Will has now mastered the process of securing the erosion control blanket and is now running to lie out the roll for the second soil wrap.

bridgereslopingsw062001After Shot: This view highlights the curve of the creek as it flows towards the culvert. Both soil wraps have just been constructed and the upper bank gently resloped. This is the finished grade for the project.

bridgeplantingsPlantings at the 1st Annual Watershed Festival: Native trees and shrubs where planted at the Paradise Creek Festival with the help of local Moscow school children. Here Idaho Fish and Game officer, Clint Rand talks with Moscow Fourth grade students about the fish and mammals of Paradise Creek.

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Palouse-Clearwater Environmental Institute

PO Box 8596

Moscow, ID 83843

Please do not mail donations or correspondence to our street address. USPS will not deliver them.

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Phone: (208) 882-1444

Email: info@pcei.org

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