US Bridges

US 1 (sr 5) over Indian Key Channel

Fair

Monroe County, Florida · Matecumbe Key (mm 78.0) · Structure no. 900095

Built
1981
44 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
2,037 ft
21 main spans
Daily traffic
15,800
2025 count
Owner
State
State Highway Agency

About this bridge

US 1 (sr 5) over Indian Key Channel is a prestressed concrete stringer/multi-beam or girder carrying US 1 (sr 5) over Indian 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 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 15,800 vehicles a day, roughly 12% of them trucks, projected to reach 27,413 by 2045. The structure is 2,037 ft (620.9 m) long and 39 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesUS 1 (sr 5)
CrossesIndian Key Channel
LocationMatecumbe Key (mm 78.0)
RouteU.S. Route 1
CountyMonroe County
StateFlorida
Coordinates24.88684, -80.68161
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating89.4 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans21
Design loadHS 20
Structure length2,037 ft (620.9 m)
Longest span97 ft (29.6 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,800 (2025)
Projected traffic27,413 by 2045
Trucks12%
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$189,000
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

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

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

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

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

About 15,800 vehicles per day (2025 count), of which roughly 12% are trucks.

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

The structure is 2,037 ft (620.9 m) long with a longest span of 97 ft (29.6 m) and a deck 39 ft wide.

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

It is owned by the State Highway Agency.