GRIST MILL HILL RD
Carrying GRIST MILL HILL RD over INDIAN RIVER
2.01 MI FROM GRAFTON TL, Grafton, New Hampshire
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: GRIST MILL HILL RD
The GRIST MILL HILL RD bridge in Grafton, New Hampshire carries GRIST MILL HILL RD over INDIAN RIVER. It was built in 1956, making it 70 years old today. The structure is built primarily of steel and spans 1 section, stretching 15.5 meters (51 feet) end to end. Daily traffic averages 404 vehicles, placing it in the lower-traffic tier of New Hampshire bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 3/9, superstructure at 5/9, substructure at 5/9. 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.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How GRIST MILL HILL RD 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 How the historical reference is calculated.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
- 1956
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 15.5 m (51 ft)
- Deck Width
- 6.4 m (21 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 404 vehicles/day
- Structure Number
- 003601720007000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 3/9, the deck (driving surface) is in poor shape, with advanced wear flagged for priority repair.
- • The superstructure (beams and supports above the deck) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
- • The substructure (piers and abutments) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
How to read this record
GRIST MILL HILL RD 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 GRIST MILL HILL RD 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 GRIST MILL HILL RD?
GRIST MILL HILL RD in Grafton, New Hampshire has a deck rating of 3/9, superstructure rating of 5/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is GRIST MILL HILL RD inspected?
GRIST MILL HILL RD'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 404 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. GRIST MILL HILL RD 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 GRIST MILL HILL RD?
An inventory load rating is not recorded for GRIST MILL HILL RD.
Who is responsible for maintaining GRIST MILL HILL RD?
GRIST MILL HILL RD is owned and maintained by City/Municipal Highway Agency.
How old is GRIST MILL HILL RD and does age affect safety?
GRIST MILL HILL RD was built in 1956, making it 70 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.