GRIFFIN MILL ROAD
Carrying GRIFFIN MILL ROAD over MAPLE FALLS BROOK
300 YDS N. OF NH 121, Rockingham, New Hampshire
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: GRIFFIN MILL ROAD
The GRIFFIN MILL ROAD bridge in Rockingham, New Hampshire carries GRIFFIN MILL ROAD over MAPLE FALLS BROOK. It was built in 1850, making it 176 years old today. It was last reconstructed in 1991, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 8.8 meters (29 feet) end to end. Daily traffic averages 187 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 1/9, superstructure at 1/9, substructure at 1/9. The weakest component sits in critical condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules. Its NBI inventory load rating is 12.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How GRIFFIN MILL ROAD 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 How the historical reference is calculated.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
- 1850
- Last Reconstructed
- 1991
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 8.8 m (29 ft)
- Deck Width
- 4.4 m (14 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 187 vehicles/day
- Structure Number
- 001300950012700
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in critical condition (1/9), with severe deterioration requiring urgent attention.
- • The superstructure (beams and supports above the deck) rates critical at 1/9, severe deterioration that needs urgent attention.
- • The substructure (piers and abutments) rates critical at 1/9, severe deterioration that needs urgent attention.
How to read this record
GRIFFIN MILL ROAD 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 GRIFFIN MILL ROAD against other structures in Rockingham 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 GRIFFIN MILL ROAD?
GRIFFIN MILL ROAD in Rockingham, New Hampshire has a deck rating of 1/9, superstructure rating of 1/9, and substructure rating of 1/9 on the FHWA's 0–9 scale.
How often is GRIFFIN MILL ROAD inspected?
GRIFFIN MILL ROAD'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 187 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. GRIFFIN MILL ROAD 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 GRIFFIN MILL ROAD?
GRIFFIN MILL ROAD has an NBI inventory load rating of 12.4 metric tons.
Who is responsible for maintaining GRIFFIN MILL ROAD?
GRIFFIN MILL ROAD is owned and maintained by City/Municipal Highway Agency.
How old is GRIFFIN MILL ROAD and does age affect safety?
GRIFFIN MILL ROAD was built in 1850, making it 176 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.