Dahlgren Backpackers Campground (Appalachian Trail, South Mountain, MD)

public land records

Researched — The record is detailed and internally consistent, and the coordinates land where the managing agency says this site is.

MD DNR 'Explore 2021 South Mountain Recreation Area and Fort Frederick State Park Complex' guide, p.7 (dnr.maryland.gov/publiclands/Documents/2021-SM-FF-Rec-Guide.pdf, read 2026-08-13), which lists this as one of exactly nine starred '*Designated Campsites' on Maryland's ~40 miles of the Appalachian NST. MD DNR South Mountain State Park page (dnr.maryland.gov/publiclands/pages/western/southmountain.aspx, read 2026-08-13): 'Designated camping areas and shelters are available on first-come-first served basis for backpackers and thru-hikers.' NPS Appalachian NST fees page (nps.gov/appa/planyourvisit/fees.htm, read 2026-08-13): 'The Appalachian Trail is free for all to enjoy. No fees, memberships, or permits are required to walk on the Trail' -- and Maryland is NOT among the states that page lists as charging overnight fees or requiring permits (those are GSMNP, Shenandoah, Vermont, the Whites, and Baxter). Coordinate = OSM node/…dahlgren ('Dahlgren AT Backpack Camping Area (camp_site, MD DNR)'), VERIFIED by projecting it onto the OSM 'Appalachian Trail - Maryland' relation 18330829: it lands at 23.13 mi south of the Mason-Dixon Line against the 23.9 mi implied by the DNR guide's own feature-to-feature distance chain (delta -0.77 mi), and sits 97 ft off the trail centreline. The residuals across all nine sites drift monotonically from -0.16 to -1.21 mi, which is the expected accumulation of the guide's 0.1-mi rounding over 24 hops, not a mismatch. County CONFIRMED as Frederick County, MD via the FCC Census Block API. NOT VERIFIED: which agency holds fee title at this exact spot -- Maryland's A.T. runs through a mix of MD DNR South Mountain State Park and the NPS A.T. corridor, and the shelters are built and maintained by the Potomac Appalachian Trail Club. Free either way per the two sources above, but land_manager='MD DNR' is the publisher's best call, not a title search. NOT VERIFIED: water. The DNR guide gives no per-site water source, so this row claims none -- do not imply a spring here. Nearest town: Boonsboro ~2.5 mi. 'Nearest town' is straight-line distance to the nearest OSM place=city/town/village and is NOT a driving distance; along the Potomac the nearest named place is often across the river in VA or WV with no nearby bridge. Ingest 2026-08-13. --- REVIEWED 2026-08-19 (nightshift-verified) --- SOURCE RE-READ. All three sources this row rests on were re-fetched today and all three still say what the row records. (1) MD DNR 'Explore 2021 South Mountain Recreation Area and Fort Frederick State Park Complex' guide (dnr.maryland.gov/publiclands/Documents/2021-SM-FF-Rec-Guide.pdf, 8.7 MB, HTTP 200 on 2026-08-19): its Appalachian Trail points-of-interest chain still carries exactly nine starred '*Designated Campsites' -- Raven Rock Shelter, Ensign Cowall Shelter, Pogo Memorial Campground, Annapolis Rock Campground, Pine Knob Shelter, Dahlgren Backpackers Campground, Rocky Run Shelter, Crampton's Gap Shelter, Ed Garvey Shelter -- which is precisely our nine rows, none missing and none extra. (2) MD DNR South Mountain State Park page (dnr.maryland.gov/publiclands/pages/western/southmountain.aspx): 'Designated camping areas and shelters are available on first-come-first served basis for backpackers and thru-hikers.' -- still verbatim, and the page still describes the park as '40-mile long'. (3) NPS Appalachian NST fees page (nps.gov/appa/planyourvisit/fees.htm, footer 'Last updated: December 19, 2025'): 'The Appalachian Trail is free for all to enjoy. No fees, memberships, or permits are required to walk on the Trail.' Its 'Overnight Fees and Permits' section still names only Great Smoky Mountains, Shenandoah, Green Mountain NF/GMC (Vermont), White Mountain NF/AMC (New Hampshire) and Baxter State Park. Maryland is still not among them. NEW RULES FOUND ON THAT SAME GUIDE PAGE, not recorded on this row at ingest and quoted here so the page can carry them: 'Camping is allowed only at designated trail shelters and campgrounds.'; 'Shelters and campsites are intended for backpackers or hikers.'; 'Maximum of six people per regular campsite.'; 'Maximum of 10 people per group campsite.'; 'Overnight hikers will be limited to a maximum two-night stay at any shelter/campsite area.' The two-night cap in particular was missing and is a real constraint on a trip plan. COORDINATE RE-VERIFIED, recomputed from scratch in this fire, and the ingest fire's arithmetic reproduces to the second decimal. Re-projected onto OSM relation 18330829 (34 member ways; note that the relation carries a disjoint out-of-state branch, so the chain was cut at the 48 km break, leaving 39.75 mi -- which agrees with DNR's own '40-mile long' description of the park). This row lands 98 ft off the trail centreline at 23.13 mi south of the Mason-Dixon Line, against the 23.9 mi implied by the guide's own feature-to-feature distance chain (delta -0.77 mi). The nine deltas still drift monotonically from -0.16 to -1.21 mi, which is exactly what 0.1-mi rounding accumulating over 23 hops looks like (worst case 23 x 0.05 = 1.15 mi); it is rounding, not a mismatch. Distances off centreline of 100-920 ft are expected and are not a defect: A.T. shelters sit at the end of short blue-blazed side trails. SECOND CHECK: this row sits 0 m from an independently mapped OSM feature way/917629003 ('Dahlgren AT Backpack Camping Area'), tagged camp_site. COUNTY re-confirmed as Frederick County, MD (state FIPS 24) via the US Census geocoder (geocoding.geo.census.gov, benchmark Public_AR_Current / vintage Current_Current, queried 2026-08-19). DUPLICATE CHECK, matched on COORDINATES and not on name: the nearest already-published-or-approved camp anywhere in the leads DB is rowid 2298 ('Dispersed camp — Frederick County, MD', published) at 1724 m -- not a duplicate; and no pending Maryland lead is within 250 m of any other. STILL NOT VERIFIED, unchanged from ingest and not to be papered over: which agency holds fee title at this exact spot (the Maryland A.T. is a mix of MD DNR South Mountain State Park and the NPS A.T. corridor, with shelters built and maintained by the Potomac Appalachian Trail Club), and water -- neither the DNR guide nor the DNR park page gives a per-site water source, so this row still claims none and the page must not imply a spring. Free either way per the DNR and NPS sources above. STATUS -> approved.

US DOE Alternative Fuels Data Center station locator, snapshot 2026-09-16. Straight-line miles to the nearest public, open, unrestricted station; restricted and planned units are shown but never counted.

On the agency's books. The land manager inventoried this site, so its existence is not in question — current conditions are. Nobody from here has camped it recently.