US Bridges

SR 91 Tpk NS 248.5 over Mill Slough

Fair

Osceola County, Florida · .15 MI S of Osceola Pkwy · Structure no. 920079

Built
1963
62 years old, rebuilt 1995
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
81,200
2022 count
Owner
Toll Authority
State Toll Authority

About this bridge

SR 91 Tpk NS 248.5 over Mill Slough is a concrete culvert carrying SR 91 Tpk NS 248.5 over Mill Slough in Osceola County, Florida. It was built in 1963 and reconstructed in 1995, so it is 62 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 81,200 vehicles a day, roughly 11% of them trucks, projected to reach 140,882 by 2040. The structure is 32 ft (9.7 m) long.

CarriesSR 91 Tpk NS 248.5
CrossesMill Slough
Location.15 MI S of Osceola Pkwy
RouteState Highway 91
StateFlorida
Coordinates28.33831, -81.37927
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionSeptember 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 rating78.2 US tons
Inventory rating47 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length32 ft (9.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81,200 (2022)
Projected traffic140,882 by 2040
Trucks11%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 91 Tpk NS 248.5 over Mill Slough built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1995.

What condition is SR 91 Tpk NS 248.5 over Mill 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 September 2023.

How much traffic does SR 91 Tpk NS 248.5 over Mill Slough carry?

About 81,200 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is SR 91 Tpk NS 248.5 over Mill Slough?

The structure is 32 ft (9.7 m) long with a longest span of 10 ft (3 m).

Who owns SR 91 Tpk NS 248.5 over Mill Slough?

It is owned by the State Toll Authority.