US Bridges

US 1 (sr 5) over North Harris Channel

Fair

Monroe County, Florida · Sugarloaf Key (mm 17.7) · Structure no. 900109

Built
1981
44 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
438 ft
6 main spans
Daily traffic
16,900
2025 count
Owner
State
State Highway Agency

About this bridge

US 1 (sr 5) over North Harris Channel is a prestressed concrete stringer/multi-beam or girder carrying US 1 (sr 5) over North Harris 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 16,900 vehicles a day, roughly 9% of them trucks, projected to reach 29,322 by 2045. The structure is 438 ft (133.5 m) long and 47 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

Open in Google Maps
CarriesUS 1 (sr 5)
CrossesNorth Harris Channel
LocationSugarloaf Key (mm 17.7)
RouteU.S. Route 1
CountyMonroe County
StateFlorida
Coordinates24.6503, -81.55568
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.6 US tons
Inventory rating44.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length438 ft (133.5 m)
Longest span82 ft (25 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,900 (2025)
Projected traffic29,322 by 2045
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed100 mi (161 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 North Harris Channel built?

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

What condition is US 1 (sr 5) over North Harris 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 North Harris Channel carry?

About 16,900 vehicles per day (2025 count), of which roughly 9% are trucks.

How long is US 1 (sr 5) over North Harris Channel?

The structure is 438 ft (133.5 m) long with a longest span of 82 ft (25 m) and a deck 47 ft wide.

Who owns US 1 (sr 5) over North Harris Channel?

It is owned by the State Highway Agency.