Find flooding reference information here.
Clean Water Services has worked with the Federal Emergency Management Services and Washington County to gather data on floodplains in Washington County. The models referenced below represent the best available information on the location, water surface elevation and cubic feet per second of peak stream flows. Watersheds 2000 Hydrologic Modeling (PDF, 4.28MB) information was created using NGVD29 datum.
This data was created for the floodplain update project and was submitted to FEMA in 2006. While these maps may help developers and others locate floodplains, they are not to be used to determine whether property owners need flood insurance and are not final. Go to fema.gov for more information.
The models are developed for use by engineers and can be viewed using free software, HEC-RAS or HEC-HMS, from the US Army Corps of Engineers.
Hydrology & Hydraulics Models contain projected 2, 5, 10, 25, 50, 100, & 500 year flows.
Existing & Future Hydrology
Future Hydrology Cedar
|Cedar Mill - North Johnson||CM Update|
Future Hydrology Chicken
Future Hydrology Hedges
Future Hydrology Nyberg
|Rock South||Rock South
Future Hydrology Rock South