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Milner Whitewater Information

The Milner Hydroelectric Project is located on a stretch of the Snake River popular with kayakers, whitewater rafters and boaters. View a trail map.

Milner Dam was built in the early 1900s for irrigation. Idaho Power and Milner Dam, Inc. improved the dam and added a hydroelectric power plant in 1992.

Recreation Facilities

  • Fire pits
  • Boat docks
  • Boat ramps
  • Whitewater access areas
  • Picnic tables
  • Vault toilets
  • Interpretive displays

Recreational Flows

Idaho Power's federal power plant license requires us to provide recreational flows for four weekend days each year. This includes the Memorial Day holiday. The flows take place from 10 a.m. to 3 p.m. between April 1 and June 30 when inflow to the project above irrigation needs is over 10,000 cubic feet per second (cfs).

Forecasts are based on Snake River flow information from the U.S. Bureau of Reclamation. Flows below Milner Dam and through the power plant depend on having water above irrigation needs.

Other factors include:

  • Snow pack
  • Flood control
  • Weather
  • Anadromous fish (fish that travel to and from the ocean) flow releases

Whitewater Releases

For the latest available flow forecasts, call 1-800-422-3143.

If water is available, submit a Milner Whitewater Release Request online, or call us toll-free at 1-800-422-3143 (option 2) to request a whitewater release date for boating below Milner Dam. Provide the following information:

  • Your first and last name
  • The date and time you want to boat
  • The number of people in your group

Flow Information

Flows can change hourly. Visit our Water Information section, or call us toll-free at 1-800-422-3143 for updated river conditions downstream from the dam and power plant.

Flow conditions on other sections of the Snake River can be found on these websites:

Snake River Milner Mile 2009

Snake River Milner Mile 2009

Snake River Milner Mile 2009 - video courtesy of Brian Ward, Mike Leeds Photography.


Important Information about
whitewater releases

  • Make your release request before 3 p.m. Mountain Daylight Time (MDT) the Friday before the requested weekend day.
  • If enough water is available and the request includes at least two boaters, the request will be granted.
  • Water will be released from the dam when at least two boaters have checked in at the Milner Power Plant on the requested release day.
  • Confirm your requested release after 4:30 p.m. (MDT) the Friday before the requested date to make sure flow levels are available. You may do this online, or by calling 1-800-422-3143.
  • Requested releases will be scheduled only if conditions allow.
  • If enough water is available, but no boaters checked in or called to cancel the release, the request will be counted as one release day.

Recommended Skill Levels

The 1.6-mile stretch of river between the dam and the power plant is a Class V-level rapid. It is recommended for experts only.

The 5.5-mile stretch of river downstream from the power plant to Star Falls is a potential Class II- or Class III-level rapid. This section is recommended for intermediate boaters when flows exceed 5,000 cfs. No flow release request is needed for this section of river.

The Bureau of Land Management offers more information on this area. It also provides area maps and fee information.

Visit the Idaho Power Parks section to learn about our other parks and recreational areas.

Related Information

Park Details

Area Information


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