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Andover bridge restricted to one lane, indefinitely

The Route 4 bridge over Blackwater River in Andover will be restricted to alternating one-way traffic for an indefinite period, according to the state Department of Transportation.

Results of a recent inspection of the single-span, 70-foot-long bridge suggest that extensive deterioration of portions of the steel plate girders make it necessary to restrict all traffic to a single lane in the center of the roadway, the DOT said in a press release yesterday.

The bridge is located approximately one-third of a mile from the Andover-Salisbury town line. Temporary signals will control traffic flow, and the lane restriction will be implemented over the next few days, the release said.

The DOT said it will be weighing options and the feasibility of bridge repair alternatives; a load posting/weight limit reduction is possible in the future.

Built in 1933, the Route 4 Bridge was added to New Hampshire’s “Red List” in May 2014. About 2,400 vehicles cross the bridge daily, according to the DOT.

Monitor staff

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