+42.84454, -71.73886
42°50'40" N, 71°44'20" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:NH 31 over STONY BROOK
Structure number:027701320012700
Location:0.4 MI FROM JCT RTE 101
Purpose:Carries highway and pedestrian walkway over waterway
Route classification:Minor Arterial (Urban) [16]
Length of largest span:49.9 ft. [15.2 m]
Total length:57.1 ft. [17.4 m]
Roadway width between curbs:2.3 ft. [0.7 m]
Deck width edge-to-edge:3.0 ft. [0.9 m]
Owner:State Highway Agency [01]
Year built:1905
Historic significance:Bridge is eligible for the National Register of Historic Places [2]
Main span material:Masonry [8]
Main span design:Arch - Deck [11]
Deck type:Not applicable [N]
Wearing surface:Bituminous [6]

Latest Available Inspection: April 2016

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:3,300 [as of 2013]
Truck traffic:4% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck geometry appraisal:Basically intolerable requiring high priority of replacement [2]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Meets minimum tolerable limits to be left in place as is [4]
Channel protection:Bank protection is in need of minor repairs. River control devices and embankment protection have a little minor damage. Banks and/or channel have minor amounts of drift. [7]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Operating rating:36.1 tons [32.8 metric tons]
Inventory rating:21.8 tons [19.8 metric tons]
Sufficiency rating:59.1
Recommended work:Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Estimated cost of work:$3,142,000

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
April 201659.1FairGoodGoodSatisfactoryFO3300
April 201459.1FairGoodGoodSatisfactoryFO3300
April 20125.0FairGoodGoodSatisfactorySD4000
April 20105.0FairGoodGoodSatisfactorySD4100
July 20085.0FairGoodGoodSatisfactorySD4100
May 20065.0FairGoodGoodSatisfactorySD4600
May 20045.0FairGoodGoodSatisfactoryFO4600
March 20025.0FairGoodGoodSatisfactoryFO4600
April 20005.0FairGoodGoodSatisfactoryFO4600
July 19985.0FairVery GoodVery GoodSatisfactoryFO4600
June 19965.0FairVery GoodVery GoodSatisfactoryFO4600
May 19945.1FairVery GoodVery GoodSatisfactoryFO3900
June 199212.3FairVery GoodVery GoodSatisfactoryFO2000
May 199012.3GoodVery GoodVery GoodGoodFO2000