feasibility plan through proposal and site analysis

Flatland Resources was hired to conduct an in-depth analysis of a 3 mile stretch of Cedar Creek between County Road 52 to the south, and the town of Waterloo to the north. This section of creek runs through the city of Auburn, and was channelized near the end of the 20th century. Due to this channelization, increasing the slope of the Creek by decreasing it’s overall length, and subsequent attempts to contain the channel utilizing traditional engineering approaches (i.e. rip rap, concrete reinforcement, etc.), erosion problems have snowballed and the steep banks have further disconnected the City from its principal waterway. Furthermore, increased channel slope and a lack of natural habitat has decimated local fish and invertebrate populations, which are still present downstream where the creek is considered a scenic waterway.

The goals of this analysis were to identify sites of importance where natural channel alignment methodology can be used to address erosion issues and begin to implement a more “naturalized” management of Cedar Creek. By improving visibility, accesibility, aesthetics, and addressing erosion issues along the Creek the city of Auburn wishes to reconnect with Cedar Creek, and extend the ecological diversity and scenic value of the creek northwards.

Flatland Resources has conducted a BEHI (Bankfull Erodibility Hazard Index) / NBS (Near-Bank Stress) Assessment in order to rank particular sites, or stretches of stream, in order of most to least at-risk of significant erosion. This assessment analyzes the approximate rates of erosion for Cedar Creek’s streambanks, and helps to identify areas where a permanent solution is necessary. FLR also conducted a rapid bioassessment survey at several sites, including a QHEI (Qualitative Habitat Evaluation Index) to determine the streams biological health. These analyses form the basis for all future design decisions, and the framework for proposed intervention sites throughout the 3 mile corridor.