Map

Thoreaus Bog

Fishing spots, fishing reports, and regulations in

Massachusetts, United States

1 catch

Top fish species at Thoreaus Bog

Smallmouth bass
Smallmouth bass
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Thoreaus Bog fishing reports

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Smallmouth bass

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General info

Thoreaus Bog is a swamp located in Middlesex County, Massachusetts, United States. It is most popular for fishing Smallmouth bass.

Location

42°27′46.5″N 71°19′41.4″W
Directions

Fishing regulations at Thoreaus Bog, MA

Disclaimer: Always check local fishing regulations, water access rights and land ownership before fishing, regardless of any catches logged in that area by the Fishbrain community. Fishbrain has mapped millions of acres of government-owned land across the USA to help you identify potential fishing access, but you are responsible for ensuring compliance with all legal requirements.

Fishing regulations in Massachusetts can change throughout the year. Make sure to check this page before fishing for the most up to date rules and regulations for the current season. Local regulations govern when you can fish, the max size of the fish you can keep, how many fish you can keep, and more.

Below you will see fishing regulations for catching Smallmouth bass as of April 27th, 2026. To view regulations for a different fish species, please click on your preferred species in the drop-down.

Smallmouth bass

Seasons

Open

Bag limit

5

Min size

12"

Measurement

Total Length

Aggregate

5

Micropterus dolomieui

Regulations for

42°27′46.5″N 71°19′41.4″W
Regulations in the map
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Local laws and licenses

Massachusetts fishing license

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Cities nearby

Concord

1.8 miles away

Hanscom AFB

2.5 miles away

Bedford

3.5 miles away

West Concord

3.9 miles away

Lexington

5.1 miles away

Acton

5.8 miles away

Waltham

6.7 miles away

Pinehurst

6.8 miles away

Burlington

6.9 miles away

Sudbury

7.3 miles away

Billerica

7.3 miles away

Weston

7.3 miles away

Wayland

7.4 miles away

Belmont

8.9 miles away

Littleton Common

8.9 miles away

Arlington

8.9 miles away

Woburn

9.0 miles away

Winchester

9.3 miles away

Cochituate

9.4 miles away

Chelmsford

9.6 miles away

Watertown Town

10.0 miles away

Westford

10.3 miles away

Framingham

12.0 miles away

Hudson

12.3 miles away

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FAQ about Thoreaus Bog fishing

Thoreaus Bog is a swamp located in Middlesex County, Massachusetts, United States. Its coordinates are:
42°27′46.5″N 71°19′41.4″W
.
Find the best fishing spots on Thoreaus Bog by looking at where other anglers have caught fish. This can easily be done in the where it is also possible to see big fish potential and how good fishing is right now along with Garmin® depth maps.
The most common species in Thoreaus Bog are:
The latest Thoreaus Bog fishing reports are:
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