US Bridges

SR-70 over Tiger Bay Slough

Fair

DeSoto County, Florida · 7.3 MI East of SR-31 · Structure no. 040031

Built
1959
66 years old, rebuilt 1979
Condition
Fair
inspected May 2024
Type
Culvert
Concrete
Length
31 ft
3 main spans
Daily traffic
5,600
2024 count
Owner
State
State Highway Agency

About this bridge

SR-70 over Tiger Bay Slough is a concrete culvert carrying SR-70 over Tiger Bay Slough in DeSoto County, Florida. It was built in 1959 and reconstructed in 1979, so it is 66 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 5,600 vehicles a day, roughly 30% of them trucks, projected to reach 9,716 by 2044. The structure is 31 ft (9.6 m) long. If it were closed, the detour would be 36.7 mi (59 km).

Location

Open in Google Maps
CarriesSR-70
CrossesTiger Bay Slough
Location7.3 MI East of SR-31
RouteState Highway 70
CountyDeSoto County
StateFlorida
Coordinates27.20943, -81.7082
Functional classRural Principal Arterial - Other

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 inspectionMay 2024
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 rating68.8 US tons
Inventory rating41.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 15
Structure length31 ft (9.6 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 traffic5,600 (2024)
Projected traffic9,716 by 2044
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36.7 mi (59 km)
TollOn a free road
National Highway SystemYes

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 SR-70 over Tiger Bay Slough built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1979.

What condition is SR-70 over Tiger Bay Slough 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 May 2024.

How much traffic does SR-70 over Tiger Bay Slough carry?

About 5,600 vehicles per day (2024 count), of which roughly 30% are trucks.

How long is SR-70 over Tiger Bay Slough?

The structure is 31 ft (9.6 m) long with a longest span of 11 ft (3.4 m).

Who owns SR-70 over Tiger Bay Slough?

It is owned by the State Highway Agency.