US Bridges

Bog Road over Connecticut River

FairPosted for load

Coos County, New Hampshire · 0.02 Mile East of Vt. S L · Structure no. 024400980006400

Built
1893
132 years old, rebuilt 2005
Condition
Fair
inspected November 2024
Type
Truss - Thru
Steel
Length
195 ft
1 main span
Daily traffic
303
2023 count
Owner
State
State Highway Agency

About this bridge

Bog Road over Connecticut River is a steel truss - thru carrying Bog Road over Connecticut River in Coos County, New Hampshire. It was built in 1893 and reconstructed in 2005, so it is 132 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. Its operating status is: posted for load restriction.

It carries about 303 vehicles a day, projected to reach 448 by 2043. The structure is 195 ft (59.4 m) long and 15 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesBog Road
CrossesConnecticut River
Location0.02 Mile East of Vt. S L
CountyCoos County
StateNew Hampshire
Coordinates44.65194, -71.56264
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating43.2 US tons
Inventory rating25.2 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+1 approach)
Design loadHS 20
Structure length195 ft (59.4 m)
Longest span151 ft (45.9 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deck20 ft (6.1 m)

Traffic and service

Average daily traffic303 (2023)
Projected traffic448 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Bog Road over Connecticut River built?

It was built in 1893, making it 132 years old in 2025. It was reconstructed in 2005.

What condition is Bog Road 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 November 2024.

How much traffic does Bog Road over Connecticut River carry?

About 303 vehicles per day (2023 count).

How long is Bog Road over Connecticut River?

The structure is 195 ft (59.4 m) long with a longest span of 151 ft (45.9 m) and a deck 15 ft wide.

Who owns Bog Road over Connecticut River?

It is owned by the State Highway Agency.