You've made this walk before, probably without thinking about what's underneath it. Park near MacArthur Boulevard, cross to the towpath, walk south past the water, end up on the patio at Old Angler's Inn with a beer or across the way at Great Falls Tavern watching the river run high after a storm. It's the default loop for a lot of Potomac. What almost nobody clocks on the way is that this exact stretch, the one everybody walks, is also the busiest half-mile in a park that runs 184.5 miles from Georgetown to Cumberland, and three of its stone culverts are old enough to predate the Civil War and currently flagged as failing.
The Busiest Stretch in a 184.5-Mile Park
The C&O Canal towpath is long. Most of it is quiet, remote, the kind of trail you'd hike for solitude. The section between Old Angler's Inn and Great Falls Tavern is the opposite. A Maryland capital budget request filed this year for repairs on this exact stretch cites average annual visitation of more than 500,000 people, accounting for 43.7 percent of all visits to the entire national historical park. Nearly half the park's foot and bike traffic funnels through a corridor you can walk in under an hour.
That concentration is exactly why the infrastructure underneath it matters more here than almost anywhere else on the canal. The towpath isn't just dirt and gravel. It sits on top of a network of stone culverts built in the 1830s and 1840s to let creeks and runoff pass under the canal without breaching it. Three of those culverts, numbered 17, 18, and 21, sit directly on this segment. Culverts 17 and 18 are downstream of Anglers Inn. Culvert 21 sits between Swains Lock and Great Falls Tavern, on the same footpath that leads to the visitor center where you've probably picked up a trail map or used the restroom before a hike.
What's Actually Wearing Out Down There
The state's fact sheet on the project doesn't hedge about condition. It describes all three culverts as failing and requiring repair to keep the towpath connected and safe. The specific work planned reads like a punch list for 19th-century masonry:
- Culvert 17: repair undercutting to restore the bearing of structural beams, preventing failure of the downstream headwall, plus spot repointing of masonry joints to restore watertightness.
- Culvert 18: removal of large vegetation growing on and around the stone masonry headwalls, followed by stone masonry infill and rechinking to stabilize both dry-laid and mortared sections.
- Culvert 21: similar stabilization work near Great Falls Tavern, on one of the most heavily trafficked approaches in the park.
None of this is dramatic in the way a bridge collapse is dramatic. It's the slow kind of failure, undercutting, vegetation working into old joints, water finding new paths through nineteenth-century stone. But it's happening under a trail that carries half the park's visitors, which is a different order of consequence than the same wear happening somewhere quiet near Hancock or Williamsport.
The scale here is smaller than what the National Park Service has spent on this canal elsewhere. A separate, unrelated preservation project in Georgetown, focused on historic locks and canal walls there, ran at roughly $12.7 million, with construction originally slated to run from spring 2024 through the winter that followed. The ask for the three Potomac-area culverts came through Maryland's 2026 legislative session as a state bond initiative rather than a federal appropriation, a far smaller and more targeted request than the Georgetown price tag. Meanwhile, a few hundred yards from Culvert 21, the nonprofit C&O Canal Trust has separately been raising $75,000 just to rehabilitate the historic Swains Lockhouse at Lock 21, a much smaller fix running on donations rather than state dollars. Two different funding mechanisms, two different timelines, both aimed at keeping the same short stretch of trail intact.
A Beer Garden That's Older Than the Culverts It Sits Near
Old Angler's Inn has been standing across the street from this stretch of canal since 1860, which makes it older than culverts 17 and 18 by a matter of decades depending on which construction phase you're counting. The Reges family has run it for close to 70 years now, and the inn's own description of the place captures something true about why people keep coming back to this particular bend in the river:
There's something about this stretch of the canal.
That's the whole pitch, and it works. The inn functions as the unofficial finish line for a lot of towpath walks and rides, a place to get a post-hike lunch on the patio or settle in at the old stone bar. Its beer garden has turned into a genuine live music venue this year, with acts like Stringtown, a five-piece Montgomery County band that formed during the pandemic, playing multiple dates through the summer, and The Outliers bringing a blues-soul-country set to the garden in late July. The calendar keeps running through fall, with a Labor Day gathering on the books today and a Halloween party set for October 31.
The Fall Calendar Sits Right on Top of the Same Ground
Head the other direction from Anglers Inn, past Culvert 21, and you reach Great Falls Tavern, which runs its own seasonal programming. An evening event called Park After Dark is scheduled at the visitor center later this month, the kind of after-hours program that gives residents a reason to walk the corridor once the sun's already down rather than racing the daylight.
Carderock Recreation Area, just up the road, has become a running destination in its own right. The Carderock Charge, a 5k, 10k, and half marathon, took place this past weekend, and a Jog N' Jam run supporting mental health awareness is set for later in September at the same recreation area. Both events use roads and trails that connect directly back to the towpath segment carrying culverts 17 and 18.
None of this is a coincidence. The same qualities that make this stretch the busiest half-mile in the park, easy access from MacArthur Boulevard, a historic inn at one end, a staffed visitor center at the other, flat and scenic towpath in between, are exactly what makes it the natural site for races, concerts, and evening programs. The infrastructure carrying all that foot traffic is the same infrastructure the state is now asking to fund repairs for.
What This Actually Means for Your Next Walk
Nothing about the current condition of these culverts should keep you off the trail. Minor monitoring and small stabilization work is already part of routine park maintenance, and the larger repairs described in the state's request are a separate matter from day-to-day trail access. If you're planning a fall weekend around this corridor, whether that's a concert at the beer garden, a run out of Carderock, or an evening walk to catch Park After Dark, check the National Park Service's current conditions page for the C&O Canal before you go, the same way you'd check for any trail with active maintenance nearby. Should the culvert repairs move forward on this segment, a corridor this heavily used would likely see at least some intermittent detours, similar to what's played out during other towpath rehabilitation efforts elsewhere on the canal.
The stretch of trail you've walked a hundred times without noticing carries more people, and more history, than almost any other quarter-mile in a 184.5-mile park. That's part of what makes it worth walking in the first place.
If you're weighing a move to Potomac, or already live here and are curious what a home near this corridor is actually worth in today's market, The Schuman Team knows this stretch of Montgomery County block by block. Get Your Home's Value and let's talk about what's next.
