> Canonical: https://marylandparks.org/trails/adt-maryland-seg-4-osm-8887227
> Content revision: 2026-10-19T18:56:14.612Z

HIKING ROUTE

# ADT - Maryland - Seg 4

Allegany · Frederick · Montgomery · Washington · approximately 151.9 mapped miles in Maryland

[Allegany parks ↗](https://marylandparks.org/counties/allegany)[Frederick parks ↗](https://marylandparks.org/counties/frederick)[Montgomery parks ↗](https://marylandparks.org/counties/montgomery)[Washington parks ↗](https://marylandparks.org/counties/washington)

## The mapped route.

Only the mapped Maryland portions are shown. Mileage is estimated from those lines, including mapped branches, and may differ from an official trail length. Disconnected lines are not instructions to cross unmapped land.

[View this route on OpenStreetMap ↗](https://www.openstreetmap.org/relation/8887227)

## Plan before you walk.

**Mapped distance**: 151.9 miles in Maryland; approximate

**Route type**: Hiking route

**Mapped operator**: American Discovery Trail Society

**OSM walking network**: National

This route comes from community-maintained map data. Access, trail condition, difficulty, seasonal restrictions, and the route’s continuity have not been independently verified. Follow current official maps, signs, and closures.

## Parks along the mapped route.

Links indicate a mapped boundary overlap, not confirmation that the park manages every segment.

[C & O Canal National Historical Park ↗](https://marylandparks.org/parks/c-and-o-canal-national-historical-park)[C&O Canal National Historic Park ↗](https://marylandparks.org/parks/c-and-o-canal-national-historic-park)[Dierssen Wildlife Management Area ↗](https://marylandparks.org/parks/dierssen-wildlife-management-area)[Green Ridge State Forest ↗](https://marylandparks.org/parks/green-ridge-state-forest)[Public Park ↗](https://marylandparks.org/parks/public-park)[River Bottom Park ↗](https://marylandparks.org/parks/river-bottom-park)[Sideling Hill Wildlife Management Area ↗](https://marylandparks.org/parks/sideling-hill-wildlife-management-area)

## Source & map data

Trail data © [OpenStreetMap contributors](https://www.openstreetmap.org/copyright), under the [Open Database License (ODbL)](https://opendatacommons.org/licenses/odbl/1-0/). [OSM relation 8887227](https://www.openstreetmap.org/relation/8887227) · source snapshot Oct 19, 2026 · imported Oct 19, 2026.

[Download this trail geometry (GeoJSON)](https://marylandparks.org/data/trails/osm-relation-8887227.geojson) · [Markdown version](https://marylandparks.org/trails/adt-maryland-seg-4-osm-8887227.md) · [Suggest a correction](https://marylandparks.org/about#corrections)