Standard permanent length is 30 ft from as measured normal highwater.
Standard seasonal length is 40 ft from as measured normal highwater.
The criteria for requesting additional length is the same for both seasonal and permanent piers. On Winnipesaukee you can request an additional 25 ft in length beyond the point where you reach 3 ft of water depth (lakebed contour elevation 501.32) as measured at normal high water (elevation 504.32). On all other lakes and pond the extension is limited to 20 ft beyond the respective 3 ft depth contour.
In the cases of extremely long dock requests there is no hard and fast rule and it has to come down to the individual circumstance of each site. In general, when people request a dock that is longer than the length of their waterfront or, when the requested length reaches triple digits; red flags go up.
The other issue that is coming up more often is requests to cross large wetlands complexes to reach open water. The Department has on occasion denied boardwalks through wetlands with the finding that the owner did not own navigable frontage on a surface water.
Maximum width for deck surfaces is 6 ft.
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