US Bridges

SR860 Mile Hill RD over Housatonic Railroad

Fair

Fairfield County, Connecticut · Entrance to Hospital · Structure no. 03817

Built
1957
68 years old
Condition
Fair
inspected May 2023
Type
Slab
Prestressed Concrete
Length
47 ft
1 main span
Daily traffic
12,300
2020 count
Owner
State
State Highway Agency

About this bridge

SR860 Mile Hill RD over Housatonic Railroad is a prestressed concrete slab carrying SR860 Mile Hill RD over Housatonic Railroad in Fairfield County, Connecticut. It was built in 1957, so it is 68 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 12,300 vehicles a day, roughly 5% of them trucks, projected to reach 18,277 by 2040. The structure is 47 ft (14.3 m) long and 52 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR860 Mile Hill RD
CrossesHousatonic Railroad
LocationEntrance to Hospital
RouteState Highway 860
CountyFairfield County
StateConnecticut
Coordinates41.40231, -73.29298
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
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
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55.7 US tons
Inventory rating42.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length47 ft (14.3 m)
Longest span42 ft (12.8 m)
Deck width52 ft (16 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,300 (2020)
Projected traffic18,277 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR860 Mile Hill RD over Housatonic Railroad built?

It was built in 1957, making it 68 years old in 2025.

What condition is SR860 Mile Hill RD over Housatonic 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 May 2023.

How much traffic does SR860 Mile Hill RD over Housatonic Railroad carry?

About 12,300 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is SR860 Mile Hill RD over Housatonic Railroad?

The structure is 47 ft (14.3 m) long with a longest span of 42 ft (12.8 m) and a deck 52 ft wide.

Who owns SR860 Mile Hill RD over Housatonic Railroad?

It is owned by the State Highway Agency.