Mongold (Detroit Lake)
Also known as Detroit Lake State Park
- Status
- Open (per official listing)
- Entrance fee
- Statewide rule — see below
- Day-use reservations
- None mentioned
- Dogs
- Statewide rule — see below
- Camping
- None listed
- Official site
- stateparks.oregon.gov(503) 854-3406
Official page last checked Oct 29, 2026. How we keep this current
Current alerts 1
Alert General advisoryThis park is within the Marion County permanent quarantine zone for all ash, olive, and white fringe tree materials. These tree materials, including… (more)
This park is within the Marion County permanent quarantine zone for all ash, olive, and white fringe tree materials. These tree materials, including firewood, must stay within the county where they were collected to help slow the spread of the emerald ash borer, a highly invasive insect, sighted in this county. Help protect our forests by following these firewood tips: • Buy firewood local to your campsite: Choose firewood harvested within 10 miles of your destination or buy certified heat-treated firewood. • Avoid transporting restricted wood: Do not bring ash, olive, or white fringe tree materials into any Oregon State Park even if it’s within the same quarantine area. When in doubt about the tree species, leave it out. Learn more about the quarantine and emerald ash borer.
Posted by the park 2024-09-04. Official alert
Overview
Mongold (Detroit Lake) is a park in Marion County, about 14 miles east of Mill City.
Popular activities here are boating, swimming, fishing, and picnicking. Facilities for water recreation include a boat ramp.
Pets
Pets must be physically restrained (held or on a leash no longer than six feet) except in designated off-leash areas or inside a vehicle, tent or pet-friendly yurt/cabin; owners pick up after pets.
Statewide rule from Oregon's park system (source). This park’s page doesn’t state its own pet rules, so check for local restrictions.
Fees and passes
'Oregon State Parks waives day-use parking fees at more than 150 parks'. Campers' receipts count as a permit. Oregon Coast Passports sold in 2026 are not accepted.
Statewide fee rule from Oregon's park system; this park’s page doesn’t list its own fees.
Oregon park passes
- 12-month day-use parking permit — $60 Oregon residents; $75 non-residents. Day-use parking at parks that require a day-use parking permit Details
- Daily parking permit — $10 per day per vehicle (residents); $12 (non-residents). Parking for the day at any state park that requires a day-use parking permit Details
From the Oregon state guide. Confirm which passes this park accepts.
Reservations
- Day use
- No day-use reservation requirement mentioned
- Booking system
- ReserveAmerica (oregonstateparks.reserveamerica.com)
- Phone
- 800-452-5687
We link to the official booking system rather than showing live availability, which changes minute to minute.
Things to do
BoatingFishingSwimmingPicnicking
Swimming
Where can I swim? The lakes and rivers found within Oregon State Parks are open to unsupervised swimming. You are responsible for your own safety. Before you enter the water, you should judge your swimming skills against possible strong currents, cold water, underwater objects and steep drop-offs. Remember, that many of our natural bodies of water and man-made reservoirs are filled by snow runoff and remain cold year round. Please bring and wear a personal flotation device and swim with a buddy. Water shoes are recommended due to rocks and debris.
Amenities
Facilities
- Restrooms
- Flush toilets
- Picnic areas
- Parking
Water
- Boat ramp
✓ 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.
Rules and permits
Know Before You Go • To check water levels, go to the U.S. Army Corps of Engineers website. • A life jacket loaner station is on site with life jackets of various sizes. Be aware of hidden obstructions beneath the surface. Wearing a life jacket, and making sure it fits properly, saves lives. • Boaters: check ahead for obstructions on the Oregon State Marine Board's Reported Obstructions and Alerts page.
Getting there
- Nearest town
- Mill City — about 14 mi east (straight line)
- Coordinates
- 44.7102, -122.1982
- Phone
- (503) 854-3406
Nearby state parks
Sources and freshness
- Oregon State Parks — park page — last checked Oct 29, 2026; page says updated Dec 30, 2025
- Oregon State Parks park finder JSON (services/park.cfc?method=getAll), used by the Find a Park page
- Wikidata
“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