US Bridges

South Park Avenue over Mill River

Fair

Fairfield County, Connecticut · 0.3 MI N of Route 15 · Structure no. 04212

Built
1946
79 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
4,386
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

South Park Avenue over Mill River is a concrete slab carrying South Park Avenue over Mill River in Fairfield County, Connecticut. It was built in 1946, so it is 79 years old, older 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 4,386 vehicles a day, roughly 5% of them trucks, projected to reach 6,517 by 2044. The structure is 32 ft (9.8 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSouth Park Avenue
CrossesMill River
Location0.3 MI N of Route 15
RouteCity Street 0
Coordinates41.23201, -73.24857
Functional classUrban Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span28 ft (8.5 m)
Deck width38 ft (11.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,386 (2024)
Projected traffic6,517 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 South Park Avenue over Mill River built?

It was built in 1946, making it 79 years old in 2025.

What condition is South Park Avenue over Mill 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 March 2024.

How much traffic does South Park Avenue over Mill River carry?

About 4,386 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is South Park Avenue over Mill River?

The structure is 32 ft (9.8 m) long with a longest span of 28 ft (8.5 m) and a deck 38 ft wide.

Who owns South Park Avenue over Mill River?

It is owned by the Town or Township Highway Agency.