NH175A
Carrying NH175A over PEMIGEWASSET RIVER
0.1 MI E JCT US 3, Grafton, New Hampshire
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: NH175A
The NH175A bridge in Grafton, New Hampshire carries NH175A over PEMIGEWASSET RIVER. It was built in 2006, making it 20 years old today. The structure is built primarily of steel continuous and spans 3 sections, stretching 111.4 meters (366 feet) end to end. Daily traffic averages 7,511 vehicles, placing it in the moderately-trafficked tier of New Hampshire bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 8/9, superstructure at 8/9, substructure at 8/9. The weakest component sits in good condition. All reported major components score above the Poor range. Its NBI inventory load rating is 49.0 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How NH175A compares
Live comparison across New Hampshire.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 2006
- Material
- Steel Continuous
- Number of Spans
- 3
- Structure Length
- 111.4 m (366 ft)
- Deck Width
- 19.7 m (65 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 7,511 vehicles/day
- Structure Number
- 012600460013900
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 8/9, the deck (driving surface) is in good shape and shows no significant wear.
- • At 8/9, the superstructure (beams and supports above the deck) is in good shape and shows no significant wear.
- • The substructure (piers and abutments) is in good condition (8/9), showing no significant deterioration.
How to read this record
This page shows what the last federal inspection recorded, not whether NH175A is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare NH175A against other structures in Grafton and across New Hampshire. New Hampshire bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for NH175A?
NH175A in Grafton, New Hampshire has a deck rating of 8/9, superstructure rating of 8/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is NH175A inspected?
NH175A's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 7,511 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. NH175A is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for NH175A?
NH175A has an NBI inventory load rating of 49.0 metric tons.
Who is responsible for maintaining NH175A?
NH175A is owned and maintained by State Highway Agency.
How old is NH175A and does age affect safety?
NH175A was built in 2006, making it 20 years old.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.