US Bridges

US 1 (sr 5) over Salt Run

Fair

Monroe County, Florida · Key West (mm 2.3) · Structure no. 900128

Built
1992
33 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
180 ft
6 main spans
Daily traffic
38,500
2025 count
Owner
State
State Highway Agency

About this bridge

US 1 (sr 5) over Salt Run is a concrete continuous slab carrying US 1 (sr 5) over Salt Run in Monroe County, Florida. It was built in 1992, so it is 33 years old, younger than the Florida average of 41.3 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 38,500 vehicles a day, roughly 4% of them trucks, projected to reach 66,798 by 2045. The structure is 180 ft (54.9 m) long and 88 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 1 (sr 5)
CrossesSalt Run
LocationKey West (mm 2.3)
RouteU.S. Route 1
CountyMonroe County
StateFlorida
Coordinates24.56516, -81.77363
Functional classUrban Other Principal 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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.3 US tons
Inventory rating38.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span33 ft (10.1 m)
Deck width88 ft (26.9 m)
Roadway width66 ft (20 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,500 (2025)
Projected traffic66,798 by 2045
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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 US 1 (sr 5) over Salt Run built?

It was built in 1992, making it 33 years old in 2025.

What condition is US 1 (sr 5) over Salt Run 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 January 2025.

How much traffic does US 1 (sr 5) over Salt Run carry?

About 38,500 vehicles per day (2025 count), of which roughly 4% are trucks.

How long is US 1 (sr 5) over Salt Run?

The structure is 180 ft (54.9 m) long with a longest span of 33 ft (10.1 m) and a deck 88 ft wide.

Who owns US 1 (sr 5) over Salt Run?

It is owned by the State Highway Agency.