US Bridges

US 1 (sr 5) over Long Key Channel

Fair

Monroe County, Florida · Long Key (mm 63.2) · Structure no. 900094

Built
1981
44 years old
Condition
Fair
inspected August 2023
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
12,176 ft
103 main spans
Daily traffic
13,200
2024 count
Owner
State
State Highway Agency

About this bridge

US 1 (sr 5) over Long Key Channel is a prestressed concrete continuous segmental box girder carrying US 1 (sr 5) over Long Key Channel in Monroe County, Florida. It was built in 1981, so it is 44 years old, older 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 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 13,200 vehicles a day, roughly 15% of them trucks, projected to reach 22,902 by 2044. The structure is 12,176 ft (3,711.2 m) long and 38 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesUS 1 (sr 5)
CrossesLong Key Channel
LocationLong Key (mm 63.2)
RouteU.S. Route 1
CountyMonroe County
StateFlorida
Coordinates24.79728, -80.86714
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.2 US tons
Inventory rating11.1 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckOther
Main spans103
Design loadHL 93
Structure length12,176 ft (3,711.2 m)
Longest span118 ft (36 m)
Deck width38 ft (11.7 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,200 (2024)
Projected traffic22,902 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$11.5 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 1 (sr 5) over Long Key Channel built?

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

What condition is US 1 (sr 5) over Long Key Channel 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 2023.

How much traffic does US 1 (sr 5) over Long Key Channel carry?

About 13,200 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is US 1 (sr 5) over Long Key Channel?

The structure is 12,176 ft (3,711.2 m) long with a longest span of 118 ft (36 m) and a deck 38 ft wide.

Who owns US 1 (sr 5) over Long Key Channel?

It is owned by the State Highway Agency.