Structure 92202000001023 · Coos County, NH

Fdr 15 over Trib. To Ammonoosuc

Carries Fdr 15 over Trib. To Ammonoosuc, Map 02.

Overall conditionFair

Set by its lowest-rated component: Substructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
23 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

23 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. 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.

Built194977 years old
Length23.0 ft7 m
Daily traffic991 lanes
Last inspectedSeptember 2023every 24 months

Location

StateNew Hampshire
CountyCoos
LocationMap 02
CarriesFdr 15
CrossesTrib. To Ammonoosuc
Coordinates44.44297, -71.30389

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length23.0 ft (7 m)
Max Span22.0 ft (6.7 m)
Deck Width15.1 ft (4.6 m)
Deck Area32.2 sq m
Main Spans1
Year Built1949

Traffic

Avg Daily Traffic99
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical4 — Foundations need monitoring
Structure Number092202000001023

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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