NH 12A
Carrying NH 12A over SUGAR RIVER
.1 MI. FROM JCT. RTE. 103, Sullivan, New Hampshire
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: NH 12A
The NH 12A bridge in Sullivan, New Hampshire carries NH 12A over SUGAR RIVER. It was built in 1967, making it 59 years old today. It was last reconstructed in 1991, extending its service life. The structure is built primarily of steel continuous and spans 3 sections, stretching 85.6 meters (281 feet) end to end. Daily traffic averages 1,051 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 3/9, superstructure at 6/9, substructure at 6/9. The weakest component sits in poor condition. A component scored 4 or below, placing this bridge in the federal Poor condition category rather than declaring it unsafe or closed. Its NBI inventory load rating is 15.1 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How NH 12A 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 How the historical reference is calculated.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
- 1967
- Last Reconstructed
- 1991
- Material
- Steel Continuous
- Number of Spans
- 3
- Structure Length
- 85.6 m (281 ft)
- Deck Width
- 10.0 m (33 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 1,051 vehicles/day
- Structure Number
- 004700720012700
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates poor at 3/9, advanced deterioration that should be prioritized for repair.
- • At 6/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • At 6/9, the substructure (piers and abutments) shows fair condition, with minor wear flagged for upkeep.
How to read this record
NH 12A is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare NH 12A against other structures in Sullivan 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 NH 12A?
NH 12A in Sullivan, New Hampshire has a deck rating of 3/9, superstructure rating of 6/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is NH 12A inspected?
NH 12A'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 1,051 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. NH 12A is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for NH 12A?
NH 12A has an NBI inventory load rating of 15.1 metric tons.
Who is responsible for maintaining NH 12A?
NH 12A is owned and maintained by State Highway Agency.
How old is NH 12A and does age affect safety?
NH 12A was built in 1967, making it 59 years old and last reconstructed in 1991.
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.