Dock, pier and float rules in Yarmouth, Massachusetts
Possibly, with Conservation Commission approval (a Notice of Intent and Order of Conditions) plus state permits. On tidal water, a private pier can be at most 4 feet wide and reach no more than 80 feet from mean high water, with floats totaling no more than 200 sq ft; on ponds, piers are limited to 30 feet long and 120 sq ft, must be seasonal, and can't have floats. Docks are barred in mapped No Dock/No Mooring Zones.
| Tidal pier max width | 4 feet [1] |
| Tidal dock max length | 80 feet from Mean High Water [2] |
| Tidal min water depth | 3 feet at Mean Low Water at seaward end [3] |
| Tidal spacing | 100 ft from channels or moorings; 250 ft from public ramps, landings, beaches [4] |
| Tidal spacing from other docks | 75 feet (marinas excepted) [11] |
| Tidal setback from property line | 25 feet [5] |
| Tidal float size limit | 200 sq ft combined (300 sq ft for shared docks) [6] |
| Seasonal components (tidal) | Out of the water Nov 1 - Apr 1 [7] |
| Freshwater pier limits | 30 ft long, 4 ft wide, 120 sq ft max; no floats [9] |
| Freshwater piers | Seasonal and removable only; no permanent piles [10] |
| No Dock/No Mooring Zones | Mapped areas where docks are not allowed [8] |
Who approves
Docks, piers and floats are regulated by the Yarmouth Conservation Commission under Part 3 of its Wetland Protection Regulations (approved March 2026). Any building in or over a wetland resource area requires a Notice of Intent, and projects must also meet the resource-area standards elsewhere in the regulations. The pier must display its MassDEP permit number, so a state Chapter 91 license is also expected (see the state section). Moorings and bottom-anchored swim floats go through the Division of Natural Resources/Harbormaster.
Tidal and estuarine docks
- Piers are at most 4 feet wide, with gaps of at least 1 inch between planks or grated decking [1].
- The whole dock, pier and float configuration may extend no more than 80 feet from Mean High Water [2].
- Water depth at the seaward end must be at least 3 feet at Mean Low Water, and dredging to reach that depth is not allowed [3].
- New docks must be 75 feet from other docks, 100 feet from channels and moorings, and 250 feet from public ramps, landings and swimming beaches [4][11], and 25 feet from property lines unless shared or with abutter consent [5].
- Floats are capped at 200 sq ft combined (300 sq ft for a shared dock), counting jet ski floats [6]. Shared docks serving neighboring lots are encouraged.
- Floats, ramps and other seasonal parts must come out between November 1 and April 1 [7].
- No new docks are allowed in the Commission's mapped No Dock/No Mooring Zones [8], or within 50 feet of eelgrass.
Freshwater ponds and lakes
Piers on ponds may be no more than 30 feet long, 4 feet wide and 120 sq ft, and no floats may be attached [9]. They must be seasonal, removable sections with no permanent piles [10], 75 feet from other piers, 5 feet (centerline) from property lines, and 250 feet from town or association landings and beaches, with at least 2 feet of water at the end. Lighting and utilities are not allowed.
Existing docks
Rebuilding a storm-destroyed dock requires a Notice of Intent within 3 years, and changes to existing docks must meet current rules as far as practicable.
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Next steps
- Check the Conservation Commission's No Dock/No Mooring Zone maps on the town website for your shoreline.
- Hire an engineer or surveyor for soundings, an eelgrass and shellfish survey (tidal sites), and plans showing distances to channels, moorings, neighboring docks and property lines.
- File a Notice of Intent with the Yarmouth Conservation Commission and get an Order of Conditions.
- Apply for a MassDEP Chapter 91 license and any Army Corps authorization; for moorings or bottom-anchored floats, contact the Division of Natural Resources/Harbormaster.
Common questions
- Can I build a dock in Yarmouth, Massachusetts?
- Possibly, with Conservation Commission approval (a Notice of Intent and Order of Conditions) plus state permits such as a MassDEP Chapter 91 license. New docks are not allowed in the Commission's mapped No Dock/No Mooring Zones or within 50 feet of eelgrass.
- How long can a dock be in Yarmouth, Massachusetts?
- On tidal water, a private pier can be at most 4 feet wide and the whole configuration can extend no more than 80 feet from Mean High Water, with at least 3 feet of water at Mean Low Water at the end. Floats are capped at 200 sq ft combined (300 sq ft for a shared dock).
- Can I put a dock on a pond in Yarmouth, Massachusetts?
- Yes, with Conservation Commission approval, but pond piers are limited to 30 feet long, 4 feet wide and 120 sq ft, with no floats. They must be seasonal, removable sections with no permanent piles, and lighting and utilities are not allowed.
- When do seasonal dock floats have to come out in Yarmouth, Massachusetts?
- On tidal water, floats, ramps and other seasonal dock parts must be out of the water between November 1 and April 1.
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
- Wetland Regulations §3.01(2), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 25
Piers will be a maximum of 4 feet wide, measured inside pile to inside pile for regular docks, and measured by deck width for monopole docks.
- Wetland Regulations §3.01(10), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 26
(10) The maximum length of dock, pier and float configurations shall not be greater than 80 feet from Mean High Water.
- Wetland Regulations §3.01(11), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 26
The water depth at the seaward side of the dock and associated floats shall be no less than 3 feet at Mean Low Water (MLW), and this minimum depth must be available between the proposed structure and navigable channels during MLW.
- Wetland Regulations §3.01(12)(b)-(c), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 27
(b) 100 feet, of a navigable channel or boat mooring. (c) 250 feet, from a public boat ramp, public landing, or public swimming beach.
- Wetland Regulations §3.01(12)(d), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 27
(d) No new pier or float system shall be located closer at any point than 25 feet to a property line, except, for a pier jointly owned and used by 2 or more contiguous shorefront properties, or written permission from the abutters is obtained in order to minimize environmental impacts such as the need for dredging.
- Wetland Regulations §3.01(13), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 27
(13) Where the project includes the use of floats, the combined size of all floats shall be consistent with the impact of the entire project on the protected values at the site, but not greater than 200 square feet with the exception for Common “Shared-use” Dock/Pier proposals that may not exceed 300 square feet.
- Wetland Regulations §3.01(16), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 27
(16) Seasonal components, including but not limited to floats and ramps, dinghies, kayaks etc... shall be removed from the water between November 1 and April 1 annually and stored above the mean high water lines.
- Wetland Regulations §3.01(19), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 27
(19) Notwithstanding these criteria, certain areas shall be designated “No Dock/No Mooring Zones”.
- Wetland Regulations §3.03(4)-(6), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 30
(4) No floats may be attached to an inland dock or pier. (5) No pier shall exceed 4 feet in width. (6) Maximum square footage of any pier shall not exceed 120 square feet (30’x4’).
- Wetland Regulations §3.03(11), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 31
(11) All new piers will be seasonal and temporary, permanent piles are prohibited.
- Wetland Regulations §3.01(12)(a), Town of Yarmouth Wetland Protection Regulations (under Wetlands Bylaw Ch. 143; approved March 19, 2026, published March 24, 2026), p. 26
(12) New proposed docks, piers and floats (as defined in these regulations) will not be allowed within: (a) 75 feet, of adjacent docks, piers and floats, with the exception marinas.