US Bridges

I-75 over Imperial River Relief

Fair

Lee County, Florida · 0.75 MI N of CR 865 · Structure no. 120148

Built
1979
46 years old, rebuilt 2011
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
33 ft
3 main spans
Daily traffic
108,000
2023 count
Owner
State
State Highway Agency

About this bridge

I-75 over Imperial River Relief is a concrete culvert carrying I-75 over Imperial River Relief in Lee County, Florida. It was built in 1979 and reconstructed in 2011, so it is 46 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 108,000 vehicles a day, roughly 11% of them trucks, projected to reach 187,380 by 2042. The structure is 33 ft (10.1 m) long.

CarriesI-75
CrossesImperial River Relief
Location0.75 MI N of CR 865
RouteInterstate 75
StateFlorida
Coordinates26.33766, -81.75149
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length33 ft (10.1 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic108,000 (2023)
Projected traffic187,380 by 2042
Trucks11%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate 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 I-75 over Imperial River Relief built?

It was built in 1979, making it 46 years old in 2025. It was reconstructed in 2011.

What condition is I-75 over Imperial River Relief 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 I-75 over Imperial River Relief carry?

About 108,000 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is I-75 over Imperial River Relief?

The structure is 33 ft (10.1 m) long with a longest span of 11 ft (3.4 m).

Who owns I-75 over Imperial River Relief?

It is owned by the State Highway Agency.