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Recreation AreaRecreation.gov

Lake Elwell

Chester, Idaho · Liberty County

Tiber Dam and its reservoir, Lake Elwell, are on the Marias River in north-central Montana. The dam and reservoir are features of the Lower Marias Unit of the Pick-Sloan Missouri Basin Project. The reservoir has 21,300 water surface acres, 21,244 land acres and 181 miles of shoreline. Major game fish include northern p…

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48.31477, -111.10323
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About Lake Elwell

Tiber Dam and its reservoir, Lake Elwell, are on the Marias River in north-central Montana. The dam and reservoir are features of the Lower Marias Unit of the Pick-Sloan Missouri Basin Project. The reservoir has 21,300 water surface acres, 21,244 land acres and 181 miles of shoreline. Major game fish include northern pike, walleye, and rainbow trout. Concrete boat ramps, campgrounds, marina, picnic shelters. Current reservoir levels

Plan Your Visit to Lake Elwell

Heading to Lake Elwell? A few things to know before you go:

  • Reservations: popular sites fill up fast — check Recreation.gov 6 months in advance
  • Fees: day-use and camping fees vary; check current rates on the official park page
  • Trash & pack-out: follow Leave No Trace principles
  • Wildlife: store food in bear boxes where provided; never feed wildlife
  • Weather: the 5-day forecast above is updated every 6 hours; verify just before you go

Frequently Asked Questions

Do I need a reservation for Lake Elwell?

No central reservation system listed for Lake Elwell. Check the official page (https://www.recreation.gov/recarea/35) for the latest entry policy and availability.

How do I get to Lake Elwell?

Site is about 18 miles southwest of Chester, Montana.

How do I contact Lake Elwell?

You can reach the park at phone: 406-759-5077 or email: GPWebmaster@usbr.gov.