US Bridges

US302 over Rocky Branch River

Good

Carroll County, New Hampshire · 1.1 Mi. from Jct. Nh 16 · Structure no. 001701910014000

Built
1990
35 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
168 ft
2 main spans
Daily traffic
6,063
2023 count
Owner
State
State Highway Agency

About this bridge

US302 over Rocky Branch River is a steel continuous stringer/multi-beam or girder carrying US302 over Rocky Branch River in Carroll County, New Hampshire. It was built in 1990, so it is 35 years old, younger 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 6,063 vehicles a day, roughly 7% of them trucks, projected to reach 8,973 by 2043. The structure is 168 ft (51.2 m) long and 47 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesUS302
CrossesRocky Branch River
Location1.1 Mi. from Jct. Nh 16
RouteU.S. Route 302
CountyCarroll County
StateNew Hampshire
Coordinates44.10324, -71.19969
Functional classRural Principal Arterial - Other

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 protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.2 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length168 ft (51.2 m)
Longest span83 ft (25.3 m)
Deck width47 ft (14.2 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,063 (2023)
Projected traffic8,973 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
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 US302 over Rocky Branch River built?

It was built in 1990, making it 35 years old in 2025.

What condition is US302 over Rocky Branch River 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 June 2024.

How much traffic does US302 over Rocky Branch River carry?

About 6,063 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US302 over Rocky Branch River?

The structure is 168 ft (51.2 m) long with a longest span of 83 ft (25.3 m) and a deck 47 ft wide.

Who owns US302 over Rocky Branch River?

It is owned by the State Highway Agency.