US Bridges

VT105 Bridge ST over Connecticut River

Fair

Coos County, New Hampshire · Vermont State Line · Structure no. 024400290020600

Built
1947
78 years old, rebuilt 2000
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
420 ft
3 main spans
Daily traffic
1,124
2023 count
Owner
State
State Highway Agency

About this bridge

VT105 Bridge ST over Connecticut River is a steel continuous stringer/multi-beam or girder carrying VT105 Bridge ST over Connecticut River in Coos County, New Hampshire. It was built in 1947 and reconstructed in 2000, so it is 78 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 1,124 vehicles a day, roughly 8% of them trucks, projected to reach 1,663 by 2043. The structure is 420 ft (128 m) long and 39 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesVT105 Bridge ST
CrossesConnecticut River
LocationVermont State Line
RouteState Highway 105
CountyCoos County
StateNew Hampshire
Coordinates44.75257, -71.63063
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating75.1 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length420 ft (128 m)
Longest span168 ft (51.2 m)
Deck width39 ft (11.9 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,124 (2023)
Projected traffic1,663 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed18 mi (29 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 VT105 Bridge ST over Connecticut River built?

It was built in 1947, making it 78 years old in 2025. It was reconstructed in 2000.

What condition is VT105 Bridge ST over Connecticut 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 August 2024.

How much traffic does VT105 Bridge ST over Connecticut River carry?

About 1,124 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is VT105 Bridge ST over Connecticut River?

The structure is 420 ft (128 m) long with a longest span of 168 ft (51.2 m) and a deck 39 ft wide.

Who owns VT105 Bridge ST over Connecticut River?

It is owned by the State Highway Agency.