Old Mill State Park
Notice: Camping is closed for the season. — details
- Status
- Open (per official listing)Daily 8 a.m. – 10 p.m.
- Entrance fee
- Statewide rule — see below
- Day-use reservations
- None mentioned
- Dogs
- Statewide rule — see below
- Camping
- Yes
- Official site
- dnr.state.mn.us(218) 754-2200
Official page last checked Oct 29, 2026. How we keep this current
Current alerts 1
Closure Camping is closed for the season.
Posted by the park 2026-10-19. Official alert
Overview
In Marshall County, about 25 miles northwest of Thief River Falls, Old Mill State Park covers about 285 acres.
Visitors come for historic sites, swimming, wildlife watching, and picnicking. The official site lists about 7 miles of trails. On the water side, there is a swimming beach. Overnight options include 2 camping areas, with RV sites with electric hookups, tent sites, and showers.
Hours
Park, gate, office and facility hours are listed separately because they often differ. Alerts above override normal hours.
| Facility | Days | Hours | Season |
|---|---|---|---|
| Park | Daily | 8 a.m. – 10 p.m. | — |
| Park | Rentals: The picnic shelter is available for rental in the summer months for group meetings or activities. Contact Lake Bronson State Park for more information. Electric sites: The park has 10 electric sites with 20 and 30 amp service. All electric sites also have water hook-up available for use when the campground water is on. RVs: No dump station available at the park. Closest dump station is 17 miles away in Warren. Trails: The park has 7 miles of hiking trails. Buildings: The swimming pond is open Memorial Weekend through Labor Day weekend. No watercraft is allowed in the pond. No motorized vehicles are allowed on the walking bridge located near the campground. Showers: Shower building is closed for the 2026 season. Drinking water: Drinking water is available year-round behind the park office. Campgrounds: The campground contains 25 mostly shaded sites near the Middle River. The campground is located within easy walking distance to the historic Larson Mill. The campground is open Memorial weekend through MEA weekend in mid-October. Bathrooms: The vault toilets throughout the park remain open year-round. Water: Water is off for the 2026 season. | ||
Official wording
Daily from 8 a.m. until 10 p.m.
There are no regular office hours at this park. For information, contact Lake Bronson State Park.
The campground contains 25 mostly shaded sites near the Middle River. The campground is located within easy walking distance to the historic Larson Mill. The campground is open Memorial weekend through MEA weekend in mid-October.
Rentals: The picnic shelter is available for rental in the summer months for group meetings or activities. Contact Lake Bronson State Park for more information. Electric sites: The park has 10 electric sites with 20 and 30 amp service. All electric sites also have water hook-up available for use when the campground water is on. RVs: No dump station available at the park. Closest dump station is 17 miles away in Warren. Trails: The park has 7 miles of hiking trails. Buildings: The swimming pond is open Memorial Weekend through Labor Day weekend. No watercraft is allowed in the pond. No motorized vehicles are allowed on the walking bridge located near the campground. Showers: Shower building is closed for the 2026 season. Drinking water: Drinking water is available year-round behind the park office. Campgrounds: The campground contains 25 mostly shaded sites near the Middle River. The campground is located within easy walking distance to the historic Larson Mill. The campground is open Memorial weekend through MEA weekend in mid-October. Bathrooms: The vault toilets throughout the park remain open year-round. Water: Water is off for the 2026 season.
Source: official park page, checked Oct 29, 2026. Times are local to the park (America/Chicago).
Pets
Pets allowed on a leash six feet or shorter (or in a portable enclosure) and personally attended; only service animals in buildings, lodging, camper cabins, yurts, tipis, tours and beach areas.
Statewide rule from Minnesota's park system (source). This park’s page doesn’t state its own pet rules, so check for local restrictions.
Fees and passes
Per vehicle: a state park vehicle permit (one-day $7 or year-round $35) is required for every vehicle; same price for residents and nonresidents. Four free park days per year. Iron Range OHV SRA states 'There is no entrance fee'.
Statewide fee rule from Minnesota's park system; this park’s page doesn’t list its own fees.
Minnesota park passes
- Year-round vehicle permit — $35. Unlimited visits to every Minnesota state park and recreation area for 12 months from the month of purchase Details
- One-day vehicle permit — $7. One day, one vehicle Details
- Additional year-round vehicle permit — $26. Additional vehicles owned by a year-round permit holder Details
- Year-round motorcycle permit — $30. Motorcycle, 12 months Details
- One-day group permit — $5. Group vehicles, one day Details
From the Minnesota state guide. Confirm which passes this park accepts.
Reservations
- Day use
- No day-use reservation requirement mentioned
- Booking system
- Reserve MN (US eDirect)
- Phone
- 866-857-2757
We link to the official booking system rather than showing live availability, which changes minute to minute.
Camping
| Campground or site type | Sites | Hookups / features | Price |
|---|---|---|---|
| Drive-in Sites The park has 25 drive-in sites. | — | ShowersRVs up to The max RV length is 67 feet. Length is measured from front of tow vehicle to rear of vehicle being towed. | — |
| Electric Sites The park has 10 electric site. | — | ElectricShowersRVs up to The max RV length is 67 feet. Length is measured from front of tow vehicle to rear of vehicle being towed. | — |
Camping details from the park
Drive-in Sites: The park has 25 drive-in sites.
Electric Sites: The park has 10 electric site.
RV Length Limit: The max RV length is 67 feet. Length is measured from front of tow vehicle to rear of vehicle being towed.
From the official park page, checked Oct 29, 2026. Site counts and prices can change; confirm when booking.
Things to do
CampingWildlife viewing and birdingHistoric sites and toursPicnickingSwimming
Trails
| Trail | Length | Difficulty | Notes |
|---|---|---|---|
| Self-Guided (summer) | — | — | The park has a mile of self-guided trails.Self-Guided |
| Hiking (summer) | — | — | The park has seven miles of hiking trails.Hiking |
| Horse (summer) | — | — | The park has a mile of horse trails that connect to additional trails outside the park. Horses may use designated snowmobile trails between March 16 and November 30. Stay off groomed snowmobile trails.Horse |
| Snowmobile (winter) | — | — | The park has 1.5 miles of groomed snowmobile trails.Snowmobile |
| Snowshoe (winter) | — | — | Snowshoeing is allowed anywhere in the park, except on groomed snowmobile trails.Snowshoe |
Trail descriptions from the park
Summer — Self-Guided: The park has a mile of self-guided trails.
Summer — Hiking: The park has seven miles of hiking trails.
Summer — Horse: The park has a mile of horse trails that connect to additional trails outside the park. Horses may use designated snowmobile trails between March 16 and November 30. Stay off groomed snowmobile trails.
Winter — Snowmobile: The park has 1.5 miles of groomed snowmobile trails.
Winter — Snowshoe: Snowshoeing is allowed anywhere in the park, except on groomed snowmobile trails.
Trail conditions: The park has 7 miles of hiking trails.
Swimming
Swimming Beach: The park has a swimming beach.
Amenities
Facilities
- Restrooms
- Flush toilets
- Vault or pit toilets
- Showers
- Picnic areas
- Picnic shelters
- Playground
Water
- Swimming beach
Camping
- Tent camping
- RV camping
- Electric hookups
✓ listed by the park · ✕ the park says it is not available. Anything not shown here isn’t mentioned by the official source — that means unknown, not unavailable.
Getting there
- Address
- 33489 240th Avenue Northwest
Argyle, MN 56713 - Nearest town
- Thief River Falls — about 25 mi northwest (straight line)
- Coordinates
- 48.3614, -96.5656
- Phone
- (218) 754-2200
- lakebronson.statepark@state.mn.us
Google Maps directionsApple MapsOfficial park map (PDF)
Directions from the park
From Newfolden, go 11 miles west on County Road 4. From Argyle, go 12 miles east on County Road 4, then 1 mile north on County Road 4 to County Road 39.
Nearby state parks
Sources and freshness
- Minnesota State Parks and Trails — park page — last checked Oct 29, 2026; page says updated Oct 19, 2026
- MN DNR A-Z list of state parks and recreation areas (park IDs in server-rendered <noscript> links) + state waysides page; details from the compass feature_detail JSON API used by park.html
- Wikidata
- USGS PAD-US 4.1 (boundary and acreage)
“Last checked” is when our system last read the official source. No change has been detected since this page was first published. Hours, fees and rules can change without notice — confirm with the park before you go. Methodology