US Bridges

Washburn Road over Patten Brook

Good

Grafton County, New Hampshire · 2.3 MI from Bristol Tl · Structure no. 000301640011800

Built
1952
73 years old, rebuilt 1999
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
1 main span
Daily traffic
534
2023 count
Owner
State
State Highway Agency

About this bridge

Washburn Road over Patten Brook is a steel stringer/multi-beam or girder carrying Washburn Road over Patten Brook in Grafton County, New Hampshire. It was built in 1952 and reconstructed in 1999, so it is 73 years old, older than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 534 vehicles a day, roughly 10% of them trucks, projected to reach 790 by 2043. The structure is 44 ft (13.4 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesWashburn Road
CrossesPatten Brook
Location2.3 MI from Bristol Tl
RouteState Highway 0
CountyGrafton County
StateNew Hampshire
Coordinates43.61407, -71.79846
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating66.2 US tons
Inventory rating39.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length44 ft (13.4 m)
Longest span41 ft (12.5 m)
Deck width33 ft (10.1 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic534 (2023)
Projected traffic790 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Washburn Road over Patten Brook built?

It was built in 1952, making it 73 years old in 2025. It was reconstructed in 1999.

What condition is Washburn Road over Patten Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does Washburn Road over Patten Brook carry?

About 534 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Washburn Road over Patten Brook?

The structure is 44 ft (13.4 m) long with a longest span of 41 ft (12.5 m) and a deck 33 ft wide.

Who owns Washburn Road over Patten Brook?

It is owned by the State Highway Agency.