US Bridges

Main Park Road over Buttonwood Canal

Fair

Monroe County, Florida · 37.33 Miles from Park Ent · Structure no. 5280002P0000000

Built
1957
68 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
388 ft
7 main spans
Daily traffic
690
2022 count
Owner
Federal
National Park Service

About this bridge

Main Park Road over Buttonwood Canal is a prestressed concrete stringer/multi-beam or girder carrying Main Park Road over Buttonwood Canal in Monroe County, Florida. It was built in 1957, so it is 68 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 690 vehicles a day, roughly 11% of them trucks, projected to reach 828 by 2042. The structure is 388 ft (118.3 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesMain Park Road
CrossesButtonwood Canal
Location37.33 Miles from Park Ent
RouteFederal Lands Road 10
CountyMonroe County
StateFlorida
Coordinates25.14969, -80.92158
Functional classRural Minor 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 protection7 GoodSome minor problems.
Last inspectionApril 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadH 15
Structure length388 ft (118.3 m)
Longest span75 ft (22.9 m)
Deck width35 ft (10.8 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic690 (2022)
Projected traffic828 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$45,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Main Park Road over Buttonwood Canal built?

It was built in 1957, making it 68 years old in 2025.

What condition is Main Park Road over Buttonwood Canal 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 April 2023.

How much traffic does Main Park Road over Buttonwood Canal carry?

About 690 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is Main Park Road over Buttonwood Canal?

The structure is 388 ft (118.3 m) long with a longest span of 75 ft (22.9 m) and a deck 35 ft wide.

Who owns Main Park Road over Buttonwood Canal?

It is owned by the National Park Service.