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Twelvemile Brook is a public river in Hampden County, Massachusetts, managed by Commonwealth of Massachusetts (public / navigable water). You can fish it on a Massachusetts fishing licence; bank access is at bridge crossings, MassWildlife access points and public parks. Massachusetts riverbeds are private property up to the ordinary high-water mark except on a few federally-declared-navigable reaches, so wading or bank fishing away from a public access point needs the landowner's permission. Public access confirmed via public-trust river.
A Massachusetts warmwater river or large stream — smallmouth and largemouth bass, chain pickerel and yellow perch. Access at MassGIS OFBA-listed sites and bridge crossings.
It runs roughly 5 miles through the Pioneer Valley region. Anglers here mostly fish for smallmouth bass, largemouth bass, chain pickerel, yellow perch. The nearest other mapped waters on PiscaMaps are Pulpit Rock Pond and Chicopee River Reservoir.
Species from PiscaMaps water-type profiles, MassWildlife trout designations and hand research.
Night fishing: No statewide night-fishing closure in Massachusetts on most inland waters — check local rules for water-supply reservoirs (Quabbin, Wachusett), which have their own posted hours and access restrictions.
Boats: Most Massachusetts rivers (the Housatonic, Deerfield, Westfield, Ipswich and Concord) are waded or floated by canoe, kayak or drift boat; the Connecticut and Merrimack take larger boats in their lower, wider reaches.
Bank & bivvy camping: You can fish this river on a Massachusetts fishing licence; bank and wading access is at MassGIS OFBA-listed sites, bridge crossings and public parks — check current signage for any water, as bank ownership and access rights vary by reach.
Tackle: Statewide bass limit is usually 4 (with a closed season in spring on most waters); trout limits vary by water; pickerel and panfish are generous. Check the current MassWildlife abstracts for this specific water.
Anyone 15 or older needs a Massachusetts fishing licence — the resident annual is about $28, the non-resident annual about $37, with non-resident 3-day (~$24) and 7-day (~$34) licences also sold. Massachusetts residents 70 and older need no licence, and anyone under 15 fishes free. Buy from MassWildlife at mass.gov/masswildlife. A Massachusetts fishing licence covers this river under the Commonwealth's public-trust doctrine for navigable waters and great ponds.
Every water carries species, bank & boat access, current regulations and live water conditions — and members get Swim Mapper, Catch Logger and Trip Planner. It's the only US map with a dedicated carp-water layer.
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