US Bridges

US302 over Saco River

Fair

Carroll County, New Hampshire · 4.4 MI Carroll Tl · Structure no. 011601270009600

Built
1949
76 years old, rebuilt 2001
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
39 ft
1 main span
Daily traffic
3,004
2023 count
Owner
State
State Highway Agency

About this bridge

US302 over Saco River is a prestressed concrete box beam or girders - multiple carrying US302 over Saco River in Carroll County, New Hampshire. It was built in 1949 and reconstructed in 2001, so it is 76 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 3,004 vehicles a day, roughly 7% of them trucks, projected to reach 4,445 by 2043. The structure is 39 ft (11.9 m) long and 47 ft wide. If it were closed, the detour would be 47.8 mi (77 km).

CarriesUS302
CrossesSaco River
Location4.4 MI Carroll Tl
RouteU.S. Route 302
Coordinates44.16507, -71.36919
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating63.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length39 ft (11.9 m)
Longest span35 ft (10.7 m)
Deck width47 ft (14.4 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,004 (2023)
Projected traffic4,445 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.8 mi (77 km)
TollOn a free road
National Highway SystemYes

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 US302 over Saco River built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 2001.

What condition is US302 over Saco River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does US302 over Saco River carry?

About 3,004 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US302 over Saco River?

The structure is 39 ft (11.9 m) long with a longest span of 35 ft (10.7 m) and a deck 47 ft wide.

Who owns US302 over Saco River?

It is owned by the State Highway Agency.