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Cooney State Park

Visit the most popular recreation area serving south central Montana featuring excellent walleye and rainbow trout fishing, boating, water-skiing and scenic mountain views.

About the Park

Head to Cooney State Park's reservoir 40 minutes south of Billings to boat, play in the water, camp, and fish. This is the most popular recreation area serving south central Montana, and it's always a busy place in the summer!

The park features good walleye and rainbow trout fishing, abundant boating opportunities, and five campgrounds with 82 campsites and three group use areas available daily around the lake. Nineteen campsites with electricity are available.

The park offers three boat ramps with docks and a fish cleaning station at Red Lodge Arm.

Park size: 309 acres. Elevation: 4,252 feet.


  • Bicycling
  • Bird Watching
  • Boating
  • Camping
  • Canoeing
  • Cross-Country Skiing
  • Fishing
  • Group Camping
  • Hiking
  • Horseshoes
  • Hunting (click for map)
  • Ice Fishing
  • Ice Skating
  • Kayaking
  • Lake Fishing
  • Motor Boating
  • Mountain Biking
  • Photography
  • Picnicking
  • Running
  • RV Camping
  • Sailing
  • Sand Volleyball Court
  • Sightseeing
  • Snowshoeing
  • Swimming
  • Water Skiing
  • Wildlife Viewing
  • Wind Surfing


Some amenities are seasonal. Check with the park for availability.

  • ADA Accessible
  • Boat Launch
  • Campsite
  • Camp Host
  • Dock
  • Electricity
  • Established Fire Pits
  • Grills/Fire Rings
  • Parking
  • Pets Allowed
  • Picnic Tables
  • Playground
  • Public Restroom
  • Shower
  • Toilets (Flush)
  • Toilets (Vault)
  • Trash Removal
  • Water

Seasons & Hours

Hours listed below are normal operating hours and may not apply when there is a special restriction or closure. Check Alerts and Closures in the tab below.


  • Open 24 hours/day all year.


  • Available

Drinking Water

  • Available May 15 - September 27.

Comfort Stations & Showers

  • Flush toilets available May 15 - September 27.
  • Metered showers available to all registered campers in Marshall Cove Campground.  Requires 8 quarters for each shower.


  • Available May 1 - November 1, weather dependent

Park Rules

Alerts & Closures

Ice Conditions

Dec. 28, 2023 - The low temperatures at night have helped the reservoir at Cooney State Park freeze-over and ice fishing is in full swing.


Restrictions and Closures

See a current list of Restrictions and Closures on State Parks and other FWP lands that may be affected by floods, fire, drought or major maintenance activities.

Pets must be on a leash at all times.


Contact the park manager for open volunteer positions at Cooney State Park.

For complete position descriptions, application forms, and details about Montana State Parks volunteer programs, visit the Volunteers page.


Montana Residents

  • Montana residents who pay the $9 state parks fee with their annual vehicle registration have no daily entrance fees to state parks. For residents who don't include this in their vehicle registration, non-resident day use fees apply.



  • Day use entrance fee with a vehicle: $8
  • Day use entrance fee as a walk-in, bicycle or bus passenger: $4
  • With a Nonresident Entrance Pass: Free



  • Campsite fees range from $4-$34 per night, depending on season and available amenities.

Montana State Parks offers hike/bike, rustic, tent, rv, and boatslip campsites. To check fees or reserve a campsite at Cooney State Park, click here.

Contact Information

Mailing Address:
Cooney State Park
86 Lake Shore Road
Roberts, MT 59070

Phone: 406-445-2326


Reservation Phone Number:


Aquatic Invasive Species

Help protect Montana's waters

AIS can be easily spread from one waterbody to the other. Anglers, boaters, construction workers, pond owners, gardeners, seaplane pilots, field workers - virtually anyone who works or plays in or around water can unknowingly transport these pests on their boats and equipment. It takes only one mistake to potentially infest a new water body.

Prevent the spread of AIS 

Cooney State Park


86 Lake Shore Road
Roberts, MT 59070
(45.44200 / -109.20500)

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Park map

View the park map to learn more about amenities, parking and camping details

View Park Map 
Park fees

Learn about fees and regulations for all Montana State Parks

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Meet The Park Manager

Dennis Merkel

During my time with the Department of Defense, I worked in an area called Morale, Welfare, and Recreation, basically all the quality-of-life programs in the military. My wife Gregrie and I lived all over the world: Bermuda, the Middle East, Japan, and Iceland. I’ve also been employed with city and county parks and recreation, US Fish and Wildlife Service, US Forest Service, and done consulting work for a nonprofit, forest-management organization. Gregrie and I always dreamed of living in Montana, and here we are…living the dream!

Mailing Address:
Cooney State Park
86 Lake Shore Road
Roberts, MT 59070

Phone: 406-445-2326

Recreation Manager Dennis Merkel