Trusted stewards of Idaho's resources, from main street to mountain top

Lake Protection Act

top left photoWe administer the Idaho Lake Protection Act and regulate encroachments and activities on, in, or above the navigable lakes in the State of Idaho. Encroachments are anything permanently fixed to the lakebed or natural features of the lakebed such as rocks. Examples of navigational and non navigational encroachments permitted by the IDL include docks, marinas, bridges, utility lines, mooring buoys, and float homes.

Encroachment Permit Applications require ALL of the following documents:

For more information regarding the requirements for Single-Family Docks, please see our Single-Family Dock Brochure here.

For more information regarding the requirements for Bank Stabilization, please see our Bank Stabilization Brochure here.

The IDL does not regulate boats/vessels (including any requirements for vessels to be illuminated), temporarily anchored boats, boating safety, or boat traffic. Those responsibilities may belong to the county government (sheriff), Idaho Department of Parks and Recreation (IDPR) as the administrator of the Idaho Safe Boating Act, or federal entities.

Water Intake Lines

Individuals seeking an encroachment permit for a water intake line on a navigable lake must use a pump that is installed and approved by the Idaho Division of Building Safety (DBS). Please see the DBS publication regarding Use of Submersible Well Pumps in Bodies of Water here for more information.


  • For questions specific to a lake
    Contact Information for Offices
    -Priest Lake Supervisory Area
    -Pend Oreille Lake Supervisory Area
    -Mica Supervisory Area
    (northern part of CdA Lake)
    -St. Joe Supervisory Area
    (southern part of CdA Lake)
    -Payette Lake Supervisory Area
  • For statewide programmatic questions
    Public Trust Lands Program
    Boise Staff Office
    (208) 334-0200

Additional Information