Dock, pier and float rules in Lexington, Massachusetts
Lexington's bylaws and rules we reviewed don't specifically regulate private docks, piers or floats; Lexington is an inland town with no harbor rules. Any dock or float in a pond, stream or wetland would still need a Conservation Commission permit under the town's wetland bylaw, which covers building any structure or driving piling in those areas.
| Driving piling or building structures in a resource area | Counts as "altering" under the wetland bylaw [2] |
No dock rules
We searched Lexington's Zoning Bylaw, the wetland protection bylaw (Code Chapter 130) and the Conservation Commission's 2021 wetland rules for docks, piers, wharves, floats and boats. None of them sets size limits, seasonal rules or zones for residential docks. The only "pier" references are to building foundations in the floodplain section. Lexington has no harbor or harbormaster rules in the documents we have.
The wetland bylaw still applies
The wetland bylaw prohibits building upon or altering any bank, pond, lake, stream, wetland or land within 100 feet of them without filing a Notice of Intent and getting a permit from the Conservation Commission [1]. The bylaw's definition of "alter" expressly includes driving piling and erecting structures of any kind [2], so a dock, pier or float in or beside a pond or stream would need Conservation Commission review and an Order of Conditions. The Commission's rules also bar new structures within 50 feet of a resource area except in extraordinary circumstances, which would make a permanent dock hard to approve.
State permits
A structure in a great pond (a natural pond over 10 acres) or certain navigable waters may also need a Chapter 91 license from MassDEP. See the state rules section for details.
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Next steps
- Contact the Lexington Conservation Office before placing any dock, float or pier in a pond, stream or wetland.
- File a Notice of Intent with the Conservation Commission if the work is in or within 100 feet of a resource area.
- Ask MassDEP whether the water body requires a Chapter 91 license.
Common questions
- Can I build a dock in Lexington, Massachusetts?
- Lexington's bylaws reviewed don't specifically regulate private docks, piers or floats, and the town is inland with no harbor rules. A dock in a pond, stream or wetland still needs a Conservation Commission permit.
- Do I need a permit for a dock on a pond in Lexington, Massachusetts?
- Yes. The wetland bylaw counts building any structure or driving piling in a resource area as altering it, which needs a Conservation Commission permit.
- Do I need a state license for a dock in Lexington, Massachusetts?
- Ask MassDEP whether the water body requires a Chapter 91 license.
Massachusetts state rules for docks and piers
A private dock in Massachusetts usually needs several layers of approval beyond local zoning.
Chapter 91 waterways license (MassDEP): any structure, regardless of size, permanent or seasonal, in tidal waters, in a great pond (a pond over 10 acres in its natural state), or in certain navigable rivers needs Chapter 91 authorization (M.G.L. c. 91; 310 CMR 9.00). For small residential docks there are simpler routes:
- a General License certification for pile-supported residential docks, piers, ramps and floats with no fill or dredging, outside ACECs and Designated Port Areas (310 CMR 9.29)
- a Simplified License for residential docks up to 600 sq ft below the high-water line (310 CMR 9.10)
Licenses must be recorded at the Registry of Deeds, and Chapter 91 protects public rights to fish, fowl and navigate.
Conservation Commission: dock work in or near wetlands, banks or land under water needs an Order of Conditions under the Wetlands Protection Act (c. 131, §40).
Harbormaster: bottom-anchored moorings, floats and rafts (no pilings) can be authorized by an annual permit from the local harbormaster instead of a Chapter 91 license (c. 91, §10A). Mooring fees can't discriminate based on residence.
U.S. Army Corps of Engineers: work in navigable waters may also need federal approval. Small private piers and floats are often covered by the Corps' Massachusetts General Permits, which can involve self-verification or pre-construction notification.
What the bylaw says
- Code Ch. 130, §130-2A, Code Chapter 130, Wetland Protection (town PDF), p. 1
A. No person shall remove, fill, dredge, build upon or alter any bank, freshwater wetland, marsh, bog, wet meadow, swamp, creek, river, stream, pond, lake, vernal pool habitat, land under water bodies, land subject to flooding, or any land bordering thereon as hereinafter defined, or riverfront area other than in the course of maintaining, repairing or replacing, but not substantially changing or enlarging, an existing and lawfully located structure or facility used in the service of the public and used to provide electric, gas, water, telephone, telegraph or other telecommunication services without first filing written notice of intent to so remove, fill, dredge, alter or build upon, including such plans as may be necessary to fully describe such proposed activity and its effect on the environment, and without receiving and complying with a permit issued by the Conservation Commission.
- Code Ch. 130, §130-8D(4), Code Chapter 130, Wetland Protection (town PDF), p. 5
(4) The driving of piling, erection of buildings or structures of any kind;