US Bridges

US 1 (sr 5) over Lignumvitae Channel

Good

Monroe County, Florida · Matecumbe Key (mm 77.5) · Structure no. 900096

Built
1981
44 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
902 ft
11 main spans
Daily traffic
15,800
2024 count
Owner
State
State Highway Agency

About this bridge

US 1 (sr 5) over Lignumvitae Channel is a prestressed concrete stringer/multi-beam or girder carrying US 1 (sr 5) over Lignumvitae 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15,800 vehicles a day, roughly 12% of them trucks, projected to reach 27,413 by 2044. The structure is 902 ft (274.9 m) long and 47 ft wide.

Location

Open in Google Maps
CarriesUS 1 (sr 5)
CrossesLignumvitae Channel
LocationMatecumbe Key (mm 77.5)
RouteU.S. Route 1
CountyMonroe County
StateFlorida
Coordinates24.88299, -80.68913
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.7 US tons
Inventory rating44.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20
Structure length902 ft (274.9 m)
Longest span82 ft (25 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,800 (2024)
Projected traffic27,413 by 2044
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Lignumvitae Channel built?

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

What condition is US 1 (sr 5) over Lignumvitae Channel in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

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

About 15,800 vehicles per day (2024 count), of which roughly 12% are trucks.

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

The structure is 902 ft (274.9 m) long with a longest span of 82 ft (25 m) and a deck 47 ft wide.

Who owns US 1 (sr 5) over Lignumvitae Channel?

It is owned by the State Highway Agency.