FEMA Floodplain Maps Effective September 28, 2007
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Principal Flood Problems
The canyon reach upstream of the former log pond formed by Shevlin Dam is conducive to forming frazil ice, which is generated in turbulent open water areas of a river during critical temperature and velocity conditions. This frazil ice has caused some flooding problems downstream in Bend in the vicinity of Mirror Pond several times since 1973, when the stored logs were removed. Presumably, frazil ice and ice jams formed upstream of the log pond prior to 1973 but were prevented from moving downstream by the stored logs.
The annual flood season for the Deschutes River extends from November through July, with a majority of the larger floods downstream from Little Deschutes River occurring in November and December. Some high water levels result from snowmelt that occurs in late spring or from irrigation releases that occur in June and July. Floods are a possibility whenever the rainfall is abnormally intense or prolonged, especially if the rain falls on an existing snowpack in the surrounding mountains. default Read more...
Changes since last mapping
- A "KML" is a file that can be downloaded and opened directly in Google Earth, ArcGIS Explorer and other viewing software available on the Internet. The KML below is for the Special Flood Hazard Area (SFHA), also known as the "100-year" flood.
- A Flood Insurance Study (FIS) is the publication developed in conjunction with the Flood Insurance Rate Map (FIRM) and discusses the engineering methods used to develop the FIRMs. The study also contains flood profiles for studied flooding sources and can be used to determine Base Flood Elevations for some areas.
- Download KML (updated Nov. 2016) -Deschutes Co SFHA KML
- Download County Flood Insurance Study - default Deschutes Co FIS (7.67 MB)
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Snapshots around the County
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Note - For general information only - DO NOT use for regulatory purposes, especially for non-modernized areas: see "description" for source information and disclaimer
(hint: once in Viewer select "Basemap" in upper left corner for imagery background)