Patapsco Valley State Park

Patapsco Valley State Park Alerts

Bike and Foot Races - September 16 and 17, 2023​

From south of McKeldin to Hollofield - Patapsco Trail Fest​

Trail users, please be advised that a mountain bike race/ ride will be occurring on September 17th. This bike race/ride will be an all day event and will include areas south of McKeldin to Hollofield (The area includes, Woodstock, Daniels and Pickall). The longest race is a 28 mile loop. You may want to consider one of our many other beautiful trails within Patapsco Valley State Park during this time. The Mckeldin proper area (area between the North and South Branch of the Patapsco River and Marriottsville rd) as well as everything south of Ellicott City will not be used for this event.

Grist Mill Trail

Updated information July 11, 2023

The Grist Mill Trail will be open for use tomorrow morning 9AM. Please be careful on the trail as the park will continue to do small projects along the trail like removing and adding split rail fencing, mowing, and tree work. Access to and from both tunnel trails are on the down steam side of each bridge. Remember to take all trash with you when leaving the park.

ALERT - Posted 6/3/2021 - The water quality of the Patapsco River can fluctuate frequently due to a variety of environmental factors. It is recommended that visitors check on the water quality prior to recreating in the river.

To check the water quality of the Patapsco River, please go to