Situated at the northern end of the St. Mary's River watershed, the park shows a wide range of habitats, from wooded acres and fields to swamps and small streams. With such a diversity, you can also find many different types of plant and animal species. Check out a map of the area. St. Mary's River State Park is separated into two areas, Sites 1 and 2. The Site 1 area holds the 250 acre St. Mary's Lake. Located along Maryland Route 5, between Leonardtown and Great Mills, at the end of Camp Cosoma Road, the area has become a popular freshwater fishing spot. Several species of fish are common to the lake including largemouth bass, chain pickerel, crappie, bluegill and sunfish. The lake has been designated a trophy bass lake and as such, special fishing regulations may be in effect. Fishermen should check bulletin boards or contact park personnel for details.

2 months ago

Nice trail. We didn’t think we would hike the entire length of the trail but we made it! It was beautiful and quiet though muddy in spots. There were lots of roots, too. The trail was well marked and fairly well maintained.
Most of the bicyclists were pleasant but one apparently thought he owned the trail. He really startled me. Thankfully, I was able to get out of his way in time.
Autumn seems to be a good time to hike this trail as there were no bugs and the temperature was perfect. I agree with the reviewer who suggested the addition of a few benches. We would’ve welcomed those!

great hiking trails my dog loves that there's water everywhere

mountain biking
5 months ago

lots of roots and mud if you biking it. most of the trail was closed off. not very well maintained.

nice trail, bikes also use it often. quiet park, dogs are allowed, fishing is good. its an easy but long walk, great to make yourself keep going, since its around a lake there is no shortcut back. my friend and I enjoy walking this together. nice workout

trail running
6 months ago

Very, very buggy. Was eaten alive. The trail was also quite muddy for extended stretches and many side trails were not marked. It's probably fine for a hike or easy run but not a good place for speed intervals because you will be stopping a lot to navigate mud trenches and figure out which path is the real trail.

Little more than easy. Great hike! Needs some benches along the way.

Absolutely love this trail. It was my first long distance hike. Very peaceful and beautiful scenic trails. At the end of the trail you come to this wide open space where I watched the sunset as a reward for finishing.

Brialliant app

Slightly muddy when I went but great park. I wish I brought my mountain bike for this trail. Definitely worth the trip from Richmond.

Thursday, August 10, 2017

I love this trail. 7.5 miles with some hills and lots of roots. Even on busy days you won't see many people on the trail. I like to walk it. Others will run or bike it. The lake is popular with boats with small engines or kayaks. It is watershed so it as a earth dam that is in full sun. All but that 1 mile of this trail is in shade. The park is very clean and a great deal of parking. It can take me from 2.5 to 3 hours to walk so bring water and my be a snack. I try to walk this trail at least once a month.

trail running
Friday, August 04, 2017

My goto trail area as it so close. In summer much of the lake is not visible due to leaves. Also in summer more difficult to see bikes so stay alert. Still a pretty summer run. Great in the fall and winter. The section of the damn overlooking the lake is very scenic and worth stopping to admire. I run it in 1:45 and I am a .....slow..... runner. Has some roots and I have over the years managed to hit everyone. Minimal wildlife. Sometimes deer, turkeys, and fish jumping. A few snakes, but they stay away from the trail. During the week, you can often "own" the lake and trail to yourself. More traffic on weekend.

Saturday, July 01, 2017

This is a fun easy trail if you have a few hours to spare. Saw lots of frogs/toads, squirrels, and a couple deer! Very green and peaceful!!

Great trail with many outstanding views!

Sunday, March 26, 2017

Date: 3/26/2017 Nice Hike. Watch out for mountain bikes and tree roots. Nice views of the lake with out leaves on the trees and brushes.

This trail is perfect for about a 2.5 hr activity. There are plenty of fun plank bridges over mud puddles and adorable streams in between root-plenty trail. This is my favorite activity to do on a day off work with the dog! The kids can come too, but depending on their age they may not be able to do the whole loop.

Saturday, February 18, 2017

I think it's a great hiking trail but if you are trying to do walk it with your dog beware of the bikers. The trails are very narrow and you can't see the bikes coming, really hard to move yourself and your dog out of the way to not get hit.

Monday, December 26, 2016

Excellent trail. Nothing but beauty throughout. Beware mountain hikers and the occasional unleashed dog.

Sunday, December 25, 2016

Really nice, well kept, well marked trail!

Saturday, July 02, 2016

Nice and easy trail, the lake is really beautiful. Aware of the crazy bikers that don't use the horns and suddenly appear from nowhere on a crazy speed:)

Wednesday, June 01, 2016


Monday, May 30, 2016

great easy hike when it's dry. if it's wet it can get really slippery. but great scenery.

This is one of my favorite SOMD hikes. It's beautiful in every season but fall is my favorite.

trail running
Saturday, April 23, 2016

awesome run....!

cross country skiing
Monday, September 21, 2015

Flys were terrible. Not much to look at as far a scenery. Most of the trail is wooded area. Great workout though!

Monday, March 25, 2013

I love this trail! I walk it and it takes me about 2.5 hours!

Monday, February 11, 2013

A good Saturday morning trail to get away from the house without having to drive 2 to 3 hours west to the Shan. Valley.

trail running
Tuesday, October 02, 2012

I ran this trail. Its pretty technical with lots of roots. People use this as a horseback riding trail so you have to look out for the horse waste. Other than that, its a scenic trail with stops along the lake. It goes deep into the wood but you should be fine as long as you pay attention tot he blazes.

mountain biking
Tuesday, May 10, 2011

This is my local trail, the distance is off a little. Trail is 7.5 miles and should take a novice around an hour to ride. Average fast times are between 32 and 40 minutes

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