SMITH RIVER ROAD
Carrying SMITH RIVER ROAD over SMITH RIVER
.25 MI. W. OF HILL TL, Merrimack, New Hampshire
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: SMITH RIVER ROAD
The SMITH RIVER ROAD bridge in Merrimack, New Hampshire carries SMITH RIVER ROAD over SMITH RIVER. It was built in 1941, making it 85 years old today. It was last reconstructed in 2001, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 32.3 meters (106 feet) end to end. Daily traffic averages 271 vehicles, placing it in the lower-traffic 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 7/9, substructure at 7/9. The weakest component sits in good condition. None of this bridge's reported major components fall into the Poor condition range. Its NBI inventory load rating is 25.1 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How SMITH RIVER 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 How the historical reference is calculated.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
- 1941
- Last Reconstructed
- 2001
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 32.3 m (106 ft)
- Deck Width
- 9.5 m (31 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 271 vehicles/day
- Structure Number
- 005801240014600
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • At 7/9, 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 (7/9), showing no significant deterioration.
How to read this record
This page shows what the last federal inspection recorded, not whether SMITH RIVER ROAD 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 SMITH RIVER ROAD against other structures in Merrimack 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 SMITH RIVER ROAD?
SMITH RIVER ROAD in Merrimack, New Hampshire has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is SMITH RIVER ROAD inspected?
SMITH RIVER 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 271 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SMITH RIVER ROAD 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 SMITH RIVER ROAD?
SMITH RIVER ROAD has an NBI inventory load rating of 25.1 metric tons.
Who is responsible for maintaining SMITH RIVER ROAD?
SMITH RIVER ROAD is owned and maintained by State Highway Agency.
How old is SMITH RIVER ROAD and does age affect safety?
SMITH RIVER ROAD was built in 1941, making it 85 years old and last reconstructed in 2001.
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.