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OLD TOWN LINE ROAD over COLBY BROOK

This bridge is no longer in the current National Bridge Inventory database, and has likely been demolished or abandoned.

Map

Coordinates:
+43.28933, -71.84461
43°17'22" N, 71°50'41" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:OLD TOWN LINE ROAD over COLBY BROOK
Structure number:026301590009800
Location:0.10 MI FROM NH RTE 103
Purpose:Carries highway over waterway
Route classification:Local (Rural) [09]
Length of largest span:9.8 ft. [3.0 m]
Total length:18.0 ft. [5.5 m]
Roadway width between curbs:24.6 ft. [7.5 m]
Deck width edge-to-edge:26.2 ft. [8.0 m]
Skew angle:11°
Owner:City or Municipal Highway Agency [04]
Year built:1914
Historic significance:Bridge is possibly eligible for the National Register of Historic Places [3]
Design load:M 13.5 / H 15 [2]
Main span material:Concrete [1]
Main span design:Arch - Deck [11]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Bituminous [6]

Latest Available Inspection: March 2008

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:140 [as of 1994]
Truck traffic:4% of total traffic
Deck condition:Fair [5 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Fair [5 out of 9]
Structural appraisal:Meets minimum tolerable limits to be left in place as is [4]
Deck geometry appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Water adequacy appraisal:Equal to present desirable criteria [8]
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]
Sufficiency rating:47.5
Recommended work:Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Estimated cost of work:$2,500,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
March 2008FairFairFairFair14047.5
December 1998FairSatisfactorySatisfactoryFair14048.5