US Bridges

East Thetford Road over Connecticut River

PoorPosted for load

Grafton County, New Hampshire · 0.1 MI from Vermont Sl · Structure no. 015700530011200

Built
1937
88 years old
Condition
Poor
inspected November 2024
Type
Truss - Thru
Steel
Length
471 ft
2 main spans
Daily traffic
2,160
2023 count
Owner
State
State Highway Agency

About this bridge

East Thetford Road over Connecticut River is a steel truss - thru carrying East Thetford Road over Connecticut River in Grafton County, New Hampshire. It was built in 1937, so it is 88 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 poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 2,160 vehicles a day, roughly 4% of them trucks, projected to reach 3,196 by 2043. The structure is 471 ft (143.6 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesEast Thetford Road
CrossesConnecticut River
Location0.1 MI from Vermont Sl
RouteState Highway 0
Coordinates43.81215, -72.18301
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 8 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.1 US tons
Inventory rating20 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length471 ft (143.6 m)
Longest span232 ft (70.7 m)
Deck width24 ft (7.2 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deck15 ft (4.4 m)

Traffic and service

Average daily traffic2,160 (2023)
Projected traffic3,196 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible 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 East Thetford Road over Connecticut River built?

It was built in 1937, making it 88 years old in 2025.

What condition is East Thetford Road over Connecticut River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does East Thetford Road over Connecticut River carry?

About 2,160 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is East Thetford Road over Connecticut River?

The structure is 471 ft (143.6 m) long with a longest span of 232 ft (70.7 m) and a deck 24 ft wide.

Who owns East Thetford Road over Connecticut River?

It is owned by the State Highway Agency.