US Bridges

Route 25 Southboun over Pequonnock River

Fair

Fairfield County, Connecticut · 0.7 MI S of Route 111 · Structure no. 04329

Built
1979
46 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
101 ft
1 main span
Daily traffic
17,300
2021 count
Owner
State
State Highway Agency

About this bridge

Route 25 Southboun over Pequonnock River is a prestressed concrete stringer/multi-beam or girder carrying Route 25 Southboun over Pequonnock River in Fairfield County, Connecticut. It was built in 1979, so it is 46 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 5 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 17,300 vehicles a day, roughly 6% of them trucks, projected to reach 25,706 by 2041. The structure is 101 ft (30.8 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesRoute 25 Southboun
CrossesPequonnock River
Location0.7 MI S of Route 111
RouteState Highway 25
Coordinates41.28379, -73.22337
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating37.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length101 ft (30.8 m)
Longest span95 ft (29 m)
Deck width56 ft (17 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,300 (2021)
Projected traffic25,706 by 2041
Trucks6%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 25 Southboun over Pequonnock River built?

It was built in 1979, making it 46 years old in 2025.

What condition is Route 25 Southboun over Pequonnock 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 May 2023.

How much traffic does Route 25 Southboun over Pequonnock River carry?

About 17,300 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is Route 25 Southboun over Pequonnock River?

The structure is 101 ft (30.8 m) long with a longest span of 95 ft (29 m) and a deck 56 ft wide.

Who owns Route 25 Southboun over Pequonnock River?

It is owned by the State Highway Agency.