Patapsco Valley State Park

Patapsco Valley State Park Alerts

Grist Mill Trail

Closure will start Monday October 17th 2022​

The Grist Mill Trail will be closed after Labor Day Weekend to permanently repair the footbridges. The tra​il will be closed for approximately 12 months. The Grist Mill Trail from the Patterson Viaduct footbridge off of Ilchester Rd will remain open to the Buzzards Rock trail connection. Please respect the closure as it will be unsafe to walk, bike or horse ride in the construction area due to heavy equipment use and no stream crossings. The Swinging Bridge will be open for foot traffic but not to access the Grist Mill Trail. Plan ahead, for more information click here.

Hollofield Station parking closed for CSX repair

November 28th - December 2nd 2022

Parking off of Old Fredrick Road, West of the green bridge will be closed during repair work. for more information see Howard County notice below:

CSX Transportation will begin maintenance on the railroad crossing at Old Frederick Road at the Howard/Baltimore County line in Ellicott City, starting around 9:00 a.m. on Monday, November 28th. While the crossing is closed, traffic will detour via Old Frederick Road, Johnnycake Road, Fairbrook Road, Rolling Road, US 40 and Rogers Avenue. Weather permitting, the project is expected to be completed by 5:00 p.m. on Friday, December 2nd.

Variable message boards and signs will be posted to alert the public of the project and corresponding road closure. Additionally, a recorded message at 410-313-4400 will carry details and updates.

For questions or concerns about this CSX project, contact Public Works Customer Service, at 410-313-3440 or email

Special Event North West of Marriottsville Road and East of Henryton Road

Iron Bridge Hounds will conduct a Fox Chase event in the area south of the Patapsco river, between Marriottsville Rd and Henryton road on the dates of;

  • November 17 and 26, 2021
  • December 1, 10, 15 and 29, 2021
  • January 7, 12, 21 and 26, 2022
  • February 2, 11, 16, and 25 2022
  • March 2, 11, 16, and 25 2022.

The event will be focused in the southern end of the property away from the Patapsco River. Signs will be posted on trails heading into the area to notify the public of the event, all areas will remain open. Hounds will be off leash under the control of the hunt staff for these approved events. Events may be canceled in the event of rain and/or wet conditions. As part of the event, Iron Bridge Hounds will perform required trail work within the park, mostly in this area. If you are interested in giving back to the Park, please consider joining us on trail work. For more information please email

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