Designated trail

Bay Circuit Trail BCT

Appalachian Mountain Club with the Bay Circuit Alliance · Massachusetts, United States

Published length: 370 km230 mimore than 230 mi, from the Bay Circuit Alliance and Appalachian Mountain Club page
Measured line: 296.9 km184 mi−19.8% against published
Line: In the dataset, partialLicence: ODbL 1.0
Tier: RegionalA long trail of 80 km (50 mi) or more

The map needs JavaScript. Download the line from this page.

Main line

Line: OpenStreetMap, read 2026-11-10, drawn simplified to 30 m. Credit: © OpenStreetMap contributors (ODbL). Base map: OpenFreeMap, © OpenMapTiles, data © OpenStreetMap contributors.

Download the line

Partial line

The line in the dataset measures 296.9 km against a published 370 km (−19.8%).

The published figure of more than 230 miles counts the whole greenway, including parts that are still road walks. OpenStreetMap maps the dedicated trail in 14 pieces, 296.9 km in all. The line is kept as mapped.

GPX is simplified to 5 m for devices. GeoJSON is the full-resolution line as published in this dataset. Neither carries elevation.

Main line296.9 km measured in 14 parts · OpenStreetMap

Main line: GPX, 247 KB Main line: GeoJSON, 690 KB

Credit the source

Licence: ODbL 1.0

Lines from OpenStreetMap need the credit “© OpenStreetMap contributors” and stay under the ODbL (share-alike).

release.txt: the source, licence and date the line files came from.

The record

Kind: Designated trailDesignated, maintained and published as one trail by a land agency or a trail association
Designation: Appalachian Mountain Club with the Bay Circuit Alliance
Tier: RegionalA long trail of 80 km (50 mi) or more
Listing: First setIn the first set of trails
Where: MA (Massachusetts), United States
Published length: 370 km230 mimore than 230 mi, from the Bay Circuit Alliance and Appalachian Mountain Club page. A check value, not measured from the line.
Short name: BCT
Record ID: bay-circuitStable: the directory name, never changed

Verification Checked 2026-11-10

Measured: YesThe line was downloaded and measured

Published: 370 km230 mi
Measured: 296.9 km184 migeodesic, from the line
Difference: −19.8%measured minus published
Parts: 14pieces left after joining ends within 100 m

Within 15% of the published length Beyond 15%: the record must say why

OSM relation 12779888, 1162 ways: 296.9 km in 14 parts, 19.8% short of the published 370 km. The pieces do not all join: OpenStreetMap is missing the connectors between them.

Why the lengths differ: see the notice in Download the line.

Source and licence

Line in this dataset: line.geojsonThe main line file of the record
Source status: OpenStreetMap onlyThe only source is an OpenStreetMap route relation
Publisher: Appalachian Mountain Club (leads the trail's partners; no open geometry found)
Publisher’s page: https://www.baycircuit.org/about/
Source: https://www.openstreetmap.org/relation/12779888Where to ask for the line: a layer or relation page
Line source: OpenStreetMap
Format: OpenStreetMap route relation, read through Overpass with all member ways
Main line: OSM relation 12779888: a super route whose members are the trail's own relations; every member way is included once.How the main line is told apart from alternates, connectors and side trails
Coordinates: EPSG:4326What the source stores; published files are longitude/latitude (EPSG:4326)
Licence: ODbL 1.0
May be passed on: YesThe source's terms allow its line to be passed on
OpenStreetMap only: YesOpenStreetMap is the only source of the included line
Source checked: 2026-11-10
Newer release?: osm-relation-version: Overpass rel(12779888); out meta; (version and timestamp), or the Geofabrik replication diff; fetch again when it changesHow to tell whether the source has a newer release

What the source says

OpenStreetMap contributors, ODbL 1.0 (share-alike). Credit: © OpenStreetMap contributors. The OpenStreetMap copyright page states: 'You are free to copy, distribute, transmit and adapt our data, as long as you credit OpenStreetMap and its contributors.' (https://www.openstreetmap.org/copyright, read 2026-11-10). The line included here is from OpenStreetMap, relation 12779888.

With the page it was read on. Not legal advice.

OpenStreetMap

Relation: 12779888
Note: Downloaded 2026-11-10; 1162 ways in the main line. release.txt has the source and date.

Logo

Logo not found. No logo is included. Ask the trail's holder before using its mark.

Every field of the record, with its exact value

As stored in trail.toml. The record schema says what each field means.

Field	Value
`id`	bay-circuit
`name`	Bay Circuit Trail
`short_name`	BCT
`country`	US
`regions[0]`	MA
`length_km`	370
`length_note`	more than 230 mi, from the Bay Circuit Alliance and Appalachian Mountain Club page
`tier`	regional
`designation`	Appalachian Mountain Club with the Bay Circuit Alliance
`wave`	1
`source.status`	osm-only
`source.publisher`	Appalachian Mountain Club (leads the trail's partners; no open geometry found)
`source.publisher_url`	https://www.baycircuit.org/about/
`source.url`	https://www.openstreetmap.org/relation/12779888
`source.discovery`	osm-relation-version: Overpass `rel(12779888); out meta;` (version and timestamp), or the Geofabrik replication diff; fetch again when it changes
`source.format`	OpenStreetMap route relation, read through Overpass with all member ways
`source.crs`	EPSG:4326
`source.licence`	ODbL-1.0
`source.licence_text`	OpenStreetMap contributors, ODbL 1.0 (share-alike). Credit: © OpenStreetMap contributors. The OpenStreetMap copyright page states: 'You are free to copy, distribute, transmit and adapt our data, as long as you credit OpenStreetMap and its contributors.' (https://www.openstreetmap.org/copyright, read 2026-11-10). The line included here is from OpenStreetMap, relation 12779888.
`source.attribution`	OpenStreetMap contributors (ODbL)
`source.osm_only`	true
`source.mainline`	OSM relation 12779888: a super route whose members are the trail's own relations; every member way is included once.
`source.source_checked`	2026-11-10
`source.redistributable`	true
`source.line_source`	OpenStreetMap
`source.line_file`	line.geojson
`source.length_gap_note`	The published figure of more than 230 miles counts the whole greenway, including parts that are still road walks. OpenStreetMap maps the dedicated trail in 14 pieces, 296.9 km in all. The line is kept as mapped.
`osm.relation`	12779888
`osm.note`	Downloaded 2026-11-10; 1162 ways in the main line. release.txt has the source and date.
`shield.status`	logo-not-found
`shield.logo_source`	""
`shield.contact`	Appalachian Mountain Club
`shield.note`	No logo is included. Ask the trail's holder before using its mark.
`shield.logo_file`	""
`shield.logo_owner`	Appalachian Mountain Club
`verification.verified`	true
`verification.date`	2026-11-10
`verification.measured_km`	296.9
`verification.difference_percent`	-19.8
`verification.parts`	14
`verification.note`	OSM relation 12779888, 1162 ways: 296.9 km in 14 parts, 19.8% short of the published 370 km. The pieces do not all join: OpenStreetMap is missing the connectors between them.