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Routes
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United States
Maryland
Howard County
Ellicott City

Lost Lake – Patapsco Valley State Park loop from Ellicott City

Routes
Running trails & routes
United States
Maryland
Howard County
Ellicott City

Lost Lake – Patapsco Valley State Park loop from Ellicott City

Hard

2.6

(13)

87

runners

Lost Lake – Patapsco Valley State Park loop from Ellicott City

02:28

22.4km

150m

Running

Hard run. Very good fitness required. Mostly accessible paths. Some sure footedness required. The starting point of the route is right next to a parking lot.

Last updated: April 20, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Patapsco Valley State Park

Waypoints

A

Start point

Parking

Get Directions

1

3.99 km

Swinging Bridge on Grist Mill Trail

Highlight • Bridge

The Grist Mist Trail passes through Patapsco Valley State Park, alongside the Patapsco River. For a large part of the trail, it also passes alongside the railroad.

It is best …

Tip by

2

4.85 km

Ilchester Tunnel

Highlight • Monument

If you’re looking for a thrilling trail running experience, you might want to check out the Ilchester Tunnel in Catonsville, Maryland. This viewpoint on the 1.7-mile loop trail takes you …

Tip by

3

6.03 km

The Patapsco River flows through central Maryland and into the Chesapeake Bay.

The river is known as the River of History as it played an essential role in Maryland's Industrial …

Tip by

4

8.33 km

Lost Lake

Highlight • Lake

Lost Lake is a small lake just north of the Patapsco River within Patapsco Valley State Park's Glen Artney Area. The lake often has various species of birds and vegetation to look at while you ride.

Tip by

5

16.5 km

This popular swinging bridge crosses the Patapsco River. It is a wooden suspension bridge with metal cables.

On the bridge you'll have great views of the river and surrounding woodland. …

Tip by

6

19.5 km

Patapsco Valley State Park

Highlight • Forest

The Patapsco Valley was Maryland's first and remains its largest state park. The 14,000 acres (5,700 ha) are made up of forests, winding rivers and cascading waterfalls.

It's a great …

Tip by

7

21.0 km

Gray's Mill

Highlight • Historical Site

The Gray's Mill Trail starts near the old mill house, which has an informative signpost outside describing the history of the mill. There are a number of other historic repurposed mill houses up the road in Ellicott City.

Tip by

B

22.4 km

End point

Parking

Loading

Way Types & Surfaces

Way Types

6.74 km

5.59 km

4.56 km

3.94 km

821 m

558 m

206 m

Surfaces

14.0 km

5.28 km

1.34 km

858 m

685 m

201 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

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Weather

Powered by Foreca

Today

Wednesday 15 July

38°C

21°C

0 %

Additional weather tips

Max wind speed: 19.0 km/h

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Description

If you're looking for a challenging and diverse jogging experience near Ellicott City, the Lost Lake – Patapsco Valley State Park loop delivers. This difficult 13.9-mile (22.4 km) route, with 498 feet (152 metres) of elevation gain, can be completed in an estimated 2 hours and 28 minutes, making it a rewarding option for those with good fitness seeking varied terrain and historical sights.

What to expect on Lost Lake – Patapsco Valley State Park loop from Ellicott City

This route takes you on a journey through the heart of Maryland's oldest state park, offering a mix of rugged natural-surface trails and some easier, paved sections. You'll jog alongside the winding Patapsco River, passing through lush forests and encountering picturesque spots like Cascade Falls. Keep an eye out for the historic remnants of the Avalon Dam and the Grist Mill Trail, which offers close-up views of the river and leads to the iconic Swinging Bridge in the Orange Grove Area. While some parts are relatively flat, expect significant ups and downs, especially on sections leading towards Cascade Falls, requiring sure-footedness and a decent level of fitness.

Planning your visit

Patapsco Valley State Park is easily accessible from Ellicott City and offers a feeling of being far from civilization despite its proximity to Baltimore. While specific parking details aren't provided, plan to arrive early, especially on weekends, as popular trailheads can fill up. The park is beautiful year-round, but spring and fall offer pleasant temperatures and vibrant scenery. Always carry enough water, especially during warmer months.

Trail details

  • Distance: 13.9 miles (22.4 km)
  • Elevation gain: 498 feet (152 metres)
  • Difficulty: difficult
  • Estimated time: 2 hours and 28 minutes

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