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Click here for IDWR homepage The Shoshone Falls on the Snake River by Thomas Moran (1900) used courtesy of the Gilcrease Museum


Need Help or Assistance?

If you have a specific question regarding water rights, you can speak to a water rights agent at any of the IDWR offices.

To ask a general question or request information about water rights, email us.


Regional Administrative Basins

IDWR has divided the state into more than 50 uniquely numbered administrative basins in order to coordinate water management activities. Each basin is assigned to one of the four IDWR regions.

map of administrative basins

Basin responsibilities are as follows:

NORTHERN REGION - 03, 81, 82, 83, 84, 85l, 86, 87, 91, 92, 93, 94, 95, 96, 97 98

WESTERN REGION - 02, 03, 51, 55, 57, 61, 63, 65, 67, 69, 77, 78, 79

SOUTHERN REGION - 01, 36, 37, 41, 43, 45, 47, 71, 72

EASTERN REGION - 01, 11, 13, 15, 17, 21, 22, 23, 24, 25, 27, 29, 31, 32, 33, 34, 35, 73, 74, 75
key to regions
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"The Shoshone Falls on the Snake River" by Thomas Moran (1900) used courtesy of the Gilcrease Museum
All Other Materials © 2000-2002, Idaho Department of Water Resources.