Structure 16101110006600 · Hillsborough County, NH

South Ramp over I-293 Fee Tpk

Carries South Ramp over I-293 Fee Tpk, At Amoskeag Interchange.

Overall conditionFair

Set by its lowest-rated component: Deck and Superstructure at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT104 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

104 ft end to end, longest span 52 ft. 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.

Built1957rebuilt 1988
Length104.0 ft31.7 m
Daily traffic11,866counted 2023
Last inspectedApril 2023every 24 months

Location

StateNew Hampshire
CountyHillsborough
LocationAt Amoskeag Interchange
CarriesSouth Ramp
CrossesI-293 Fee Tpk
Coordinates43.00256, -71.47521

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length104.0 ft (31.7 m)
Max Span51.8 ft (15.8 m)
Deck Width37.1 ft (11.3 m)
Deck Area358.2 sq m
Main Spans2
Year Built1957 (reconstructed 1988)

Traffic

Avg Daily Traffic11,866 (2023)
Truck Traffic4%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 24 months
OwnerState Toll Authority
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number016101110006600

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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