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NH175 over PEMIGEWASSET RIVER

Grafton County, New Hampshire

Map

Coordinates:
+44.02199, -71.68194
44°01'19" N, 71°40'55" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:NH175 over PEMIGEWASSET RIVER
Structure number:028401770014800
Location:0.05 MI FROM JCT RTE 3
Purpose:Carries highway over waterway
Route classification:Minor Collector (Rural) [08]
Length of largest span:171.9 ft. [52.4 m]
Total length:183.1 ft. [55.8 m]
Roadway width between curbs:24.0 ft. [7.3 m]
Deck width edge-to-edge:30.8 ft. [9.4 m]
Vertical clearance above deck:12.8 ft. [3.9 m]
Owner:State Highway Agency [01]
Year built:1939
Historic significance:Bridge is eligible for the National Register of Historic Places [2]
Design load:M 13.5 / H 15 [2]
Main span material:Steel [3]
Main span design:Arch - Thru [12]
Deck type:Open Grating [3]
Wearing surface:Other [9]

Latest Available Inspection: October 2017

Good/Fair/Poor Condition:Poor
Status:Open, no restriction [A]
Average daily traffic:600 [as of 2013]
Truck traffic:10% of total traffic
Deck condition:Poor [4 out of 9]
Superstructure condition:Poor [4 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Meets minimum tolerable limits to be left in place as is [4]
Deck geometry appraisal:Basically intolerable requiring high priority of replacement [2]
Water adequacy appraisal:Equal to present minimum criteria [6]
Roadway alignment appraisal:Equal to present minimum criteria [6]
Channel protection:Bank is beginning to slump. River control devices and embankment protection have widespread minor damage. There is minor stream bed movement evident. Debris is restricting the channel slightly. [6]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Operating rating:33.8 tons [30.7 metric tons]
Inventory rating:20.7 tons [18.8 metric tons]
Sufficiency rating:37.1
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
October 201737.1PoorPoorPoorSatisfactory-600
November 201637.6PoorPoorPoorSatisfactorySD600
December 201537.6PoorPoorPoorSatisfactorySD600
November 201446.3PoorPoorFairGoodSD600
December 201346.7PoorPoorFairGoodSD350
October 201249.7FairSatisfactoryFairGoodFO350
November 201149.7FairSatisfactoryFairGoodFO350
June 200949.6FairSatisfactoryFairGoodFO400
June 200749.6FairSatisfactoryFairGoodFO420
October 200349.7FairSatisfactoryFairGoodFO360
June 200149.7FairSatisfactoryFairGoodFO360
July 199950.7FairGoodFairGoodFO360
September 199754.7FairSatisfactoryFairGood-360
April 199553.4FairSatisfactoryFairGood-360
May 199358.6FairSatisfactoryFairGood-200
November 199168.8FairSatisfactorySatisfactorySatisfactory-200