Structure 14800880011200 · Grafton County, NH

I-93 Parkway over Ped Underpass

Carries I-93 Parkway over Ped Underpass, 7.4mi No Woodstock T.l..

Overall conditionGood

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

How ratings work
Culvertsets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT28 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 7/9

A culvert 28 ft across. 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, so those are drawn as typical for a culvert.

Built198541 years old
Length27.9 ft8.5 m
Daily traffic11,599counted 2023
Last inspectedMay 2023every 24 months

Location

StateNew Hampshire
CountyGrafton
Location7.4mi No Woodstock T.l.
CarriesI-93 Parkway
CrossesPed Underpass
Coordinates44.14277, -71.68206

Physical Characteristics

MaterialConcrete
DesignCulvert
Total Length27.9 ft (8.5 m)
Max Span27.9 ft (8.5 m)
Deck Width130.9 ft (39.9 m)
Deck Area339.1 sq m
Main Spans1
Year Built1985

Traffic

Avg Daily Traffic11,599 (2023)
Truck Traffic9%
Lanes On Bridge4

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number014800880011200

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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