Structure 19701360008800 · Rockingham County, NH

Nh111 over Csx

Carries Nh111 over Csx, 3.04mi NW Jct 1-a.

Overall conditionGood

Set by its lowest-rated component: Substructure at 7 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT37 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

37 ft end to end. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a slab bridge.

Built1927rebuilt 1995
Length37.1 ft11.3 m
Daily traffic3,778counted 2023
Last inspectedJuly 2023every 24 months

Location

StateNew Hampshire
CountyRockingham
Location3.04mi NW Jct 1-a
CarriesNh111
CrossesCsx
Coordinates42.97269, -70.82855

Physical Characteristics

MaterialPrestressed Concrete
DesignSlab
Total Length37.1 ft (11.3 m)
Max Span32.2 ft (9.8 m)
Deck Width44.6 ft (13.6 m)
Deck Area153.7 sq m
Main Spans1
Year Built1927 (reconstructed 1995)

Traffic

Avg Daily Traffic3,778 (2023)
Truck Traffic24%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour CriticalNot applicable
Structure Number019701360008800

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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