Harmon Lake Trail is a 7.4 mile moderately trafficked loop trail located near Mandan, North Dakota that features a lake and is rated as moderate. The trail offers a number of activity options and is best used from May until October. Dogs are also able to use this trail.

7.4 miles
429 feet

dog friendly


mountain biking

nature trips




wild flowers


6 months ago

About a 9 mile hike. Went with my sister and it took about 3.5 hours to complete with a few water breaks. The view of the lake is beautiful and the trail itself has some good variety in terms of terrain, scenery, animals and plants.

mountain biking
7 months ago

Nice flowing single track trail winding along the lake and surrounding hills. Good mix of technical area in the trees with free flowing area on surrounding hills. They added and additional 4.2 miles of trail so it's now 13.2 miles around, well worth riding!

mountain biking
7 months ago

My first time ever off road mountain biking- I had a great time! The harder part is that I was out of shape, so it seems harder. I’ve already done it again 2 more times since then- improved my time!

8 months ago

Fantastic trail . Easy to follow.
I did hiking
I saw many biking there ,
I will go again for sure

Friday, June 30, 2017

The posted mileage is 8.85 miles. It was so beautiful! Definitely a challenge with all the switchbacks but not too strenuous. I love how the trail goes in and out of forest areas surrounded by trees and wide open spaces. It took us 5 hours at a leisurely pace to complete with a few breaks to take pictures and snacks.

Wednesday, May 24, 2017

Definitely a long trail for an out of shape beginner but beyond the length it was not difficult. Beautiful views of the lake though.

Sunday, September 18, 2016

It was more miles then they posted. It is a deceiving hike because the lake had so many fingers and it is a long way around. It was however beautiful.

Thursday, August 25, 2016

Great trail to hike... Nice to get away from biso and be around a lovely lake with awesome scenery.

mountain biking
Saturday, May 11, 2013

I started off my ride at the Northwest Trail Head with a nice hilltop view of Harmon Lake. The first section of the trail on the West side of the lake was mostly beginner with rolling hills and a few cut-backs. The wind was coming out of the North of course and so I had the wind to my back for the first part of my trek. As I reached the South end of the lake it takes you into the bottoms and over the inlet where the lake receives most of it's run-off. There is a nice metal float bridge in place to cross over. From here the trail climbs with moderate technical features through the South and East side of the lake. There are many sharp corners throughout with only a few longer downhill stretches to meet your need for speed. On the final stretch there are a few switchbacks and cliffhangers as you make your way back to the face of the dam. Overall this was definitely a trail for beginner to moderate mountain bikers who want to test their endurance as well as get a good workout in. My dog Rocco made the trek as well with only a few short breaks for water and a swim on this dog friendly trail.

2 months ago

4 months ago

6 months ago

Saturday, December 16, 2017

Monday, August 28, 2017

Wednesday, August 09, 2017

Tuesday, July 11, 2017

Saturday, September 17, 2016

Saturday, July 02, 2016

mountain biking
Tuesday, August 20, 2013

Friday, August 31, 2012