Sarah Mildred Long Bridge, Kittery, Maine - Portsmouth, New Hampshire
SEGMENTS, FALL 2014, VOL. 59
The Sarah Mildred Long (SML) Bridge Replacement Project is an important regional crossing linking Maine and New Hampshire across the Piscataqua River as part of the US Route 1 Bypass. The Maine Department of Transportation with the cooperation and support of the New Hampshire Department of Transportation and the Federal Highway Association have completed the final bridge design and presented it at a public open house on September 18, 2014.
With a focus on safety, function, economy, and aesthetics, the bridge features concrete segmental spans for vehicles above and heavy rail below. Span lengths for the vehicular bridge include 162', 270', 283', 307', 320’, 2 @ 210', 319', 221', and 132'. The heavy rail bridge below has concrete segmental spans of 102', 3 @ 160', 135', 2 @ 69', 135', 2 @ 160', and 127'. The 56' vertical clearance over the navigational channel provides for passage of almost 70% of the vessels in the typical position. The four towers supporting the lift span, which goes up for 135' clearance and down for trains, are precast concrete segmental hollow sections uniquely shaped to accommodate the internal workings of the lifting mechanisms. The bridge was designed by FIGG/Hardesty & Hanover, Joint Venture, with FIGG accomplishing the segmental bridge spans.
Construction of the new bridge is anticipated to begin this fall, with completion in November 2017. Additional information is on http://www.maine.gov/mdot/sml/