DORCHESTER ROAD
Carrying DORCHESTER ROAD over GRANT BROOK
2.1 MI FROM JCT RTE 10, Grafton, New Hampshire
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
DORCHESTER ROAD in Grafton, New Hampshire sits above 17% of rated New Hampshire bridges on inventory load rating (25 t), while its 1952 build year is earlier than 69% of Grafton's recorded-year cohort (544 bridges).
DORCHESTER ROAD in Grafton, New Hampshire is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1952, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure NH:015701020009900
INTERSTATE-ERA · STEEL · SINGLE-SPAN · SUPER-LED · ARTERIAL-ADT · STANDARD-LOAD · CAT-POOR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- SINGLE-SPAN Single span
- SUPER-LED Superstructure-led
- ARTERIAL-ADT Arterial ADT
- STANDARD-LOAD Standard load
- CAT-POOR Poor
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: DORCHESTER ROAD
The DORCHESTER ROAD bridge in Grafton, New Hampshire carries DORCHESTER ROAD over GRANT BROOK. It was built in 1952, making it 74 years old today. It was last reconstructed in 1984, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 12.5 meters (41 feet) end to end. Daily traffic averages 1,110 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 7/9, superstructure at 4/9, substructure at 6/9. The weakest component sits in poor condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules.
How DORCHESTER ROAD compares
Age against the county: built in 1952, earlier than 378 of Grafton's 544 bridges with a recorded construction year (69%), against a county median build year of 1968. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across New Hampshire bridges with a recorded inventory load rating (2,540 of 2,542 rated).
DORCHESTER ROAD vs every rated New Hampshire bridge
Inventory load rating (metric tons), FHWA NBI, this state
25 Top 83% higher than 17% of 2,540 bridges
rated New Hampshire bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Grafton inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 544 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1952
- Last Reconstructed
- 1984
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 12.5 m (41 ft)
- Deck Width
- 9.6 m (31 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 1,110 vehicles/day
- Structure Number
- 015701020009900
Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • The superstructure (beams and supports above the deck) rates poor at 4/9, with advanced deterioration recorded on the latest inspection.
- • The substructure (piers and abutments) rates fair at 6/9, minor deterioration that routine maintenance should address.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
DORCHESTER 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 DORCHESTER ROAD 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 DORCHESTER ROAD?
DORCHESTER ROAD in Grafton, New Hampshire has a deck rating of 7/9, superstructure rating of 4/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is DORCHESTER ROAD inspected?
DORCHESTER 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 1,110 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. DORCHESTER 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 DORCHESTER ROAD?
DORCHESTER ROAD has an NBI inventory load rating of 24.5 metric tons.
Who is responsible for maintaining DORCHESTER ROAD?
DORCHESTER ROAD is owned and maintained by State Highway Agency.
How old is DORCHESTER ROAD and does age affect safety?
DORCHESTER ROAD was built in 1952, making it 74 years old and last reconstructed in 1984.
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.
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Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.