Programs & Projects
197th Street Ravine—Stopping Erosion
When water washes through an eroding ravine, it sends sediment and pollutants into our lakes, rivers and wetlands. A particularly problematic eroding ravine at 197th Street in Scandia has been a key priority for Watershed District.
The ravine, which abuts 13 properties including land owned by the City of Scandia and the National Park Service, has been eroding for nearly a decade. The District hired Wenck Engineering to conduct a feasibility study for stabilizing and reconstructing it.
Two options were identified by the engineers: The first removes some of the overhead tree canopy on the south side of the ravine, installs a manhole at the end of the current culvert and directs flows into an additional 12-inch culvert down the reshaped ravine to a stilling pond. The second alternative would de-activate the existing culvert leading from the catch basin and redirect flows with a new culvert to the southeast to intersect a city platted street. Both options include a raingarden to capture and infiltrate the polluted runoff. At an estimated $37,000, option one is approximately $5,000 less expensive than option two.
The engineers presented the options (see attachment below) to the Watershed District managers in June, with a presentation for property owners in October. While residents were supportive they expressed concern about tree loss and land disturbance and wanted to better understand the solutions. “Fixing the ravine is a complicated task and the District is committed to doing it right,” said Watershed District Administrator Jim Shaver. Stay tuned for updates as the project moves forward.
|197th St Ravine Study.ppt||5.59 MB|