US Bridges

SR 31 over Caloosahatchee River

Fair

Lee County, Florida · 1MI N of SR 80 · Structure no. 120064

Built
1960
65 years old, rebuilt 2020
Condition
Fair
inspected October 2023
Type
Movable - Bascule
Steel
Length
778 ft
1 main span
Daily traffic
16,600
2022 count
Owner
State
State Highway Agency

About this bridge

SR 31 over Caloosahatchee River is a steel movable - bascule carrying SR 31 over Caloosahatchee River in Lee County, Florida. It was built in 1960 and reconstructed in 2020, so it is 65 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 16,600 vehicles a day, roughly 22% of them trucks, projected to reach 28,801 by 2044. The structure is 778 ft (237.1 m) long and 37 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 31
CrossesCaloosahatchee River
Location1MI N of SR 80
RouteState Highway 31
CountyLee County
StateFlorida
Coordinates26.71626, -81.76068
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating37.4 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+13 approach)
Design loadH 20
Structure length778 ft (237.1 m)
Longest span105 ft (32 m)
Deck width37 ft (11.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck18 ft (5.6 m)

Traffic and service

Average daily traffic16,600 (2022)
Projected traffic28,801 by 2044
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

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$60,000
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR 31 over Caloosahatchee River built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2020.

What condition is SR 31 over Caloosahatchee River 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 October 2023.

How much traffic does SR 31 over Caloosahatchee River carry?

About 16,600 vehicles per day (2022 count), of which roughly 22% are trucks.

How long is SR 31 over Caloosahatchee River?

The structure is 778 ft (237.1 m) long with a longest span of 105 ft (32 m) and a deck 37 ft wide.

Who owns SR 31 over Caloosahatchee River?

It is owned by the State Highway Agency.