Prohibited Development

Special provisions apply to development within the area referred to as the floodway and to watercourse alterations within the Special Flood Hazard Area (SFHA). The floodway is the part of the floodplain that is necessary to discharge the base flood without the cumulative increase of the base flood’s elevation by more than one foot. It is specifically the areas designated as a floodway by FEMA on our locally adopted FIRM (Flood Insurance Rate Map).

The floodway is usually extremely hazardous during flooding due to the velocity of flood waters, which also carries debris. It is also important for this area to remain unobstructed in order to hold and convey floodwaters out of our community.

All encroachments, including fill, new construction, substantial improvements and other development is prohibited unless certified by a registered professional engineer or architect with sufficient documentation demonstrating that encroachments shall not result in ANY increase in flood levels during the occurrence of the base flood.

Watercourse Alterations
Special requirements also apply to watercourse alterations. The watercourses that are regulated are those shown on the FIRM and are usually labeled, such as Spring Creek. Alterations to watercourses must maintain their hydraulic capacity and meet other requirements.

For More Information
Anyone interested in purchasing, developing or redeveloping property that is even partially within the floodway is encouraged to contact Public Works Engineering staff at 541-682-8400. Anyone interested in altering a watercourse should also contact city staff. 

Flood Hazard Information Assistance
The City of Eugene provides free information regarding the flood hazard for specific sites within our community and related issues at the Permit and Information Center. We can be reached by phone at 541-682-8400 or in person at 99 West 10th Avenue. We are open to the public from 9:00 am to 5:00 pm, Monday through Friday. We strive to return all calls within one business day.