- Published on Thursday, 14 April 2011 18:37
Countywide FEMA Floodplain Maps Effective December 3, 2009
***See Interactive Map Tool at bottom of page***
Principal Flood Problems
Abnormally heavy or prolonged rainfall, sometimes combined with snowmelt and frozen or nearly saturated ground, may cause flooding in Josephine County.
All streams in Josephine County usually respond to the same storm event, but the quantitative response can vary considerably. For example, most steams reached record stages during the devastating floods of December 1964; peak stages on the Applegate River, although high in 1964, were exceeded in January 1974. Read more...
Changes since last mapping
The 1- and 0.2-percent-annual-chance floods were redelineated on Gilbert Creek and portions of the
Rogue River using new topography with a one-foot contour interval provided by the City of Grants
Pass. The cross section locations were digitized from the effective Floodway panels or work maps.
Elevations used for the redelineation were taken from the effective floodway data tables and adjusted to the NAVD88 vertical datum. The redelineation along Gilbert Creek extended from SW Rogue River Avenue to just upstream of NW Windsor Drive, a distance of approximately 2.5 miles. Redelineation along the Rogue River extended from approximately river station 111,810 to river station 158,250 (cross section CD to cross section DJ – see Flood Insurance Study).
The floodplain boundaries for all other flooding sources were digitized from the effective FIRM and
Floodway panels. Aerial photography and USGS 7.5' Quadrangles were used to adjust floodplain and floodway boundaries where appropriate.
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.
- Download KML -Josephine_Co_SFHA (588.51 kB)
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 County Flood Insurance Study -
None planned at this time
Snapshots around the County
None at this time
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)