US Bridges

Fleming Key Road over Garrison Bight

Fair

Monroe County, Florida · 1.5 KM N of US 1 · Structure no. 1FL1322

Built
1965
60 years old, rebuilt 2010
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
336 ft
6 main spans
Daily traffic
250
2013 count
Owner
Federal
Navy / Marines

About this bridge

Fleming Key Road over Garrison Bight is a prestressed concrete stringer/multi-beam or girder carrying Fleming Key Road over Garrison Bight in Monroe County, Florida. It was built in 1965 and reconstructed in 2010, so it is 60 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 250 vehicles a day, roughly 20% of them trucks, projected to reach 260 by 2032. The structure is 336 ft (102.4 m) long and 29 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesFleming Key Road
CrossesGarrison Bight
Location1.5 KM N of US 1
CountyMonroe County
StateFlorida
Coordinates24.56708, -81.79561
Functional classUrban Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.6 US tons
Inventory rating22.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadUnknown
Structure length336 ft (102.4 m)
Longest span56 ft (17.1 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2013)
Projected traffic260 by 2032
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNavy / Marines
Maintained byNavy / Marines
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$70,000 (2023 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Fleming Key Road over Garrison Bight built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 2010.

What condition is Fleming Key Road over Garrison Bight 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 March 2023.

How much traffic does Fleming Key Road over Garrison Bight carry?

About 250 vehicles per day (2013 count), of which roughly 20% are trucks.

How long is Fleming Key Road over Garrison Bight?

The structure is 336 ft (102.4 m) long with a longest span of 56 ft (17.1 m) and a deck 29 ft wide.

Who owns Fleming Key Road over Garrison Bight?

It is owned by the Navy / Marines.