US Bridges

US 1 (sr 5) over Spanish Harbor Channel

Fair

Monroe County, Florida · Big Pine Key (mm 33.5) · Structure no. 900106

Built
1982
43 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
3,484 ft
41 main spans
Daily traffic
13,700
2024 count
Owner
State
State Highway Agency

About this bridge

US 1 (sr 5) over Spanish Harbor Channel is a prestressed concrete stringer/multi-beam or girder carrying US 1 (sr 5) over Spanish Harbor Channel in Monroe County, Florida. It was built in 1982, so it is 43 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 13,700 vehicles a day, roughly 14% of them trucks, projected to reach 23,770 by 2044. The structure is 3,484 ft (1,062 m) long and 39 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesUS 1 (sr 5)
CrossesSpanish Harbor Channel
LocationBig Pine Key (mm 33.5)
RouteU.S. Route 1
CountyMonroe County
StateFlorida
Coordinates24.6484, -81.32425
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating68.8 US tons
Inventory rating39.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans41
Design loadHS 20
Structure length3,484 ft (1,062 m)
Longest span86 ft (26.2 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,700 (2024)
Projected traffic23,770 by 2044
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$22,000
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 1 (sr 5) over Spanish Harbor Channel built?

It was built in 1982, making it 43 years old in 2025.

What condition is US 1 (sr 5) over Spanish Harbor 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 June 2024.

How much traffic does US 1 (sr 5) over Spanish Harbor Channel carry?

About 13,700 vehicles per day (2024 count), of which roughly 14% are trucks.

How long is US 1 (sr 5) over Spanish Harbor Channel?

The structure is 3,484 ft (1,062 m) long with a longest span of 86 ft (26.2 m) and a deck 39 ft wide.

Who owns US 1 (sr 5) over Spanish Harbor Channel?

It is owned by the State Highway Agency.