US Bridges

SR 847 (thomaston over Naugatuck Railroad

Fair

New Haven County, Connecticut · .6 MI North of W. Main ST · Structure no. 05241

Built
1981
44 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
157 ft
1 main span
Daily traffic
13,800
2023 count
Owner
State
State Highway Agency

About this bridge

SR 847 (thomaston over Naugatuck Railroad is a steel stringer/multi-beam or girder carrying SR 847 (thomaston over Naugatuck Railroad in New Haven County, Connecticut. It was built in 1981, so it is 44 years old, younger than the Connecticut average of 56.7 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 13,800 vehicles a day, roughly 3% of them trucks, projected to reach 20,505 by 2043. The structure is 157 ft (47.9 m) long and 49 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSR 847 (thomaston
CrossesNaugatuck Railroad
Location.6 MI North of W. Main ST
RouteState Highway 847
CountyNew Haven County
StateConnecticut
Coordinates41.5671, -73.05488
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length157 ft (47.9 m)
Longest span141 ft (43 m)
Deck width49 ft (14.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,800 (2023)
Projected traffic20,505 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 847 (thomaston over Naugatuck Railroad built?

It was built in 1981, making it 44 years old in 2025.

What condition is SR 847 (thomaston over Naugatuck Railroad 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 SR 847 (thomaston over Naugatuck Railroad carry?

About 13,800 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is SR 847 (thomaston over Naugatuck Railroad?

The structure is 157 ft (47.9 m) long with a longest span of 141 ft (43 m) and a deck 49 ft wide.

Who owns SR 847 (thomaston over Naugatuck Railroad?

It is owned by the State Highway Agency.