Sarah Mildred Long Bridge

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Sarah Mildred Long Bridge
Sarah Mildred Long Bridge 01.jpg
Sarah Mildred Long Bridge seen from Kittery, ME
Coordinates 43°05′09″N 70°45′39″W / 43.0859°N 70.76091°W / 43.0859; -70.76091Coordinates: 43°05′09″N 70°45′39″W / 43.0859°N 70.76091°W / 43.0859; -70.76091
Carries US 1 Bypass
Crosses Piscataqua River
Locale Portsmouth, NH and Kittery, ME
Official name Sarah Mildred Long Bridge
Maintained by Maine-New Hampshire Interstate Bridge Authority
ID number 021702510010800[1]
Design Steel Truss Lift Bridge
Total length 854.7 m (2,804 ft)
Width 9.1 m (29.9 ft)
Clearance above 5.09 m (16.7 ft)
Clearance below 41 m (134.5 ft) (Lift span open)
Opened 1940
Daily traffic 14,000 (2014)
14,900 (1990)

The Sarah Mildred Long Bridge is a lift bridge that carries the US 1 Bypass over the Piscataqua River between Portsmouth, New Hampshire and Kittery, Maine. The bridge is a double deck truss bridge, with the US 1 Bypass road deck above and a railroad bed below.

The bridge features two separate movable spans. While the main lift span and its towers are the obvious primary moving feature, the second moving span is only apparent to water and rail traffic. On the north side of the bridge, the first non-trussed section of rail bed lifts up and moves south as a retractable bridge, coming to rest on top of the rail tracks inside the truss. This creates a waterway large enough for most recreational boats to pass through without the need for interruption of automobile traffic on the bridge.

Work on a replacement began in January 2015.[2]


Completed in 1940, the bridge is the second to carry motor vehicle traffic between Maine and New Hampshire at Portsmouth, and replaced a river crossing dating from 1822.[3] The bridge was the direct result of the work of the Maine-New Hampshire Interstate Bridge Authority, which had been formed in 1937. The major goal of the bridge project was to relieve congestion in downtown Portsmouth and Kittery, where US 1 crossed the river via the Memorial Bridge, which had opened in 1923.

From 1960 until 1972, the bridge, along with the US 1 Bypass north of the Portsmouth Circle, filled a gap in Interstate 95, which had been designated along both the New Hampshire Turnpike and the Maine Turnpike. Although most of the Bypass is four lanes wide, the bridge itself originally had only a three-lane roadbed, with traffic on the center lane switching direction depending on load (the bridge has since been reduced to just two lanes). This, combined with being a drawbridge, placed the bridge far below Interstate highway standards. The turnpikes, and therefore I-95 in the two states, did not directly connect until the opening of the Piscataqua River Bridge and the extensions of I-95 leading to it in the early 1970s.

On April 1, 2013, a large tanker ship clipped the bridge, causing "severe structural damage" and leading to the bridge being closed to vehicular traffic.[4] The I-95 Piscataqua River Bridge was the only Portsmouth bridge over the Piscataqua remaining open.

The bridge was repaired and re-opened to vehicle traffic on May 13, 2013.[5]


The railroad track that runs across the bridge was originally part of the Boston & Maine Railroad, and connected to South Berwick via an easement that is now Rt. 236. The bridge replaced a railroad trestle that was located just upriver. The trestle collapsed on September 10, 1939, sending the engine (B&M #3666) and baggage car to the bottom of the river, where they remain. It had been weakened when a caisson used in the construction of the new bridge dragged its anchor cables, which pulled out several of the trestle's bents.

Currently, the tracks lead only to the Portsmouth Naval Shipyard in Kittery, and are used for the transportation of nuclear materials.


For many years, the bridge was simply known as the Maine-New Hampshire (Interstate) Bridge. In 1987, the bridge was renamed to honor Sarah M. Long, who had been an employee of the Maine-New Hampshire Interstate Bridge Authority for 50 years. Starting with the agency in 1937 when the Authority was created, Ms. Long filled a number of positions, from secretary to executive director.[6]

Due to its location in Portsmouth Harbor between the Memorial Bridge and the Piscataqua River Bridge, the Sarah Mildred Long Bridge is sometimes simply referred to as "the middle bridge" or "the old toll bridge." It has also been called the "Dime Bridge," in reference to the amount paid when it was a toll bridge.


A replacement bridge is being planned and will be designed by a joint venture of Hardesty & Hanover and Figg Engineering. The proposed replacement will be higher than the current bridge, allowing for more ship traffic to pass underneath without opening the bridge. It will have 11 fewer piers in the river, as well as an improved collision system in the event of a ship impacting it. The bridge deck will also have wider shoulders for bicycles. Maine and New Hampshire officials have negotiated a cost of $158.5 million with the contractor, Cianbro, to conduct the work, which began early in 2015. $25 million was awarded by the U.S. Department of Transportation for the railroad portion of the work.[7]

Image gallery[edit]

See also[edit]


External links[edit]

  • Legislation outlining the formation of the Maine-New Hampshire Interstate Bridge Authority
  • More pictures of the bridge, including the movable rail section in the closed position