Harmon Lake

Harmon Lake Harmon Lake Recreation Area, located on Otter Creek just eight miles north of Mandan on Highway 1806, offers an adventurous atmosphere of amenities.

Harmon Lake Recreation Area features a 145-acre reservoir located on Otter Creek. The reservoir measures 38 feet at its deepest point. Rock fishing piers and a boat ramp and dock provide access opportunities for those to enjoy the lake. Two sandy beaches are located along the shore of the lake. Harmon Lake is a no wake waterbody, meaning boats must travel at a slow idle speed. Personal watercrafts

are not allowed on the lake. The lake is stocked with rainbow trout and cutthroat trout fingerlings. The multiuse trail features just over 19 miles of terrain for biking, hiking or birding. The trail is designed as a sustainable single track, unpaved trail allowing walkers, hikers, birders or bikers reach several areas throughout the recreation area. Camping is also available at the lake. There are 33 individual spots and two 5 camper group pads, all with electricity. Individual sites are available on a first come first served basis, unless you rent a shelter. The group pads can be reserved. See http://www.co.morton.nd.us/index.asp?Type=B_BASIC&SEC={00D8FB9A-751F-4072-9299-C9B5B59D8890} for information on fees. Future plans include constructing shelters, a multi-use building to accommodate large group gatherings, volleyball courts, playgrounds, public restrooms with showers and horseback riding facilities.

T-shirt deadline is approaching, get registered today!
05/16/2026

T-shirt deadline is approaching, get registered today!

It is getting to be that time ⌛

MTB Racers, if you would like a FREE shirt with your registration you need to sign up before midnight on May 27th! We will not be ordering extra shirts. Pre-register by May 27th to guarantee yours!

🔗: https://runsignup.com/Race/ND/Mandan/OtterCreek55

Race day is creeping up!
05/15/2026

Race day is creeping up!

04/28/2026
Mother nature has made a lot of progress, but we're not there quite yet.
03/29/2026

Mother nature has made a lot of progress, but we're not there quite yet.

Trails are extremely wet and muddy and will remain closed
03/21/2026

Trails are extremely wet and muddy and will remain closed

With an early spring likely, the trails at Harmon are closed until the muddy conditions are gone.  Thank you for respect...
03/07/2026

With an early spring likely, the trails at Harmon are closed until the muddy conditions are gone. Thank you for respecting the closure.

Not a great day to be on the trails, extremely muddy
02/15/2026

Not a great day to be on the trails, extremely muddy

02/09/2026
No time like the present to sign up!
02/01/2026

No time like the present to sign up!

Address

Hwy 1806 & County Road 140
Mandan, ND
58554

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