Structure 21200900010700 · Merrimack County, NH

Bridge Street over Suncook River

Carries Bridge Street over Suncook River, 0.3 Mi From Nh RTE 107.

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
Channelnot part of overall9/9 · Excellent
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT102 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

102 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 multi-beam bridge.

Built1909rebuilt 1996
Length102.0 ft31.1 m
Daily traffic96counted 2023
Last inspectedAugust 2023every 24 months

Location

StateNew Hampshire
CountyMerrimack
Location0.3 Mi From Nh RTE 107
CarriesBridge Street
CrossesSuncook River
Coordinates43.30814, -71.32887

Physical Characteristics

MaterialConcrete
DesignStringer/Multi-beam
Total Length102.0 ft (31.1 m)
Max Span98.1 ft (29.9 m)
Deck Width29.9 ft (9.1 m)
Deck Area283.0 sq m
Main Spans1
Year Built1909 (reconstructed 1996)

Traffic

Avg Daily Traffic96 (2023)
Truck Traffic4%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number021200900010700

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.

Nearby Bridges