US Bridges

SR-33 over Diers Canal

Fair

Polk County, Florida · 9.8 MI North of I-4 · Structure no. 160005

Built
1939
86 years old, rebuilt 1976
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
25 ft
3 main spans
Daily traffic
10,337
2022 count
Owner
State
State Highway Agency

About this bridge

SR-33 over Diers Canal is a concrete culvert carrying SR-33 over Diers Canal in Polk County, Florida. It was built in 1939 and reconstructed in 1976, so it is 86 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 10,337 vehicles a day, roughly 24% of them trucks, projected to reach 17,935 by 2044. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 20.5 mi (33 km).

Location

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CarriesSR-33
CrossesDiers Canal
Location9.8 MI North of I-4
RouteState Highway 33
CountyPolk County
StateFlorida
Coordinates28.23907, -81.82089
Functional classRural 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.4 US tons
Inventory rating18.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 15
Structure length25 ft (7.7 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,337 (2022)
Projected traffic17,935 by 2044
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed20.5 mi (33 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR-33 over Diers Canal built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1976.

What condition is SR-33 over Diers Canal 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 2023.

How much traffic does SR-33 over Diers Canal carry?

About 10,337 vehicles per day (2022 count), of which roughly 24% are trucks.

How long is SR-33 over Diers Canal?

The structure is 25 ft (7.7 m) long with a longest span of 8 ft (2.4 m).

Who owns SR-33 over Diers Canal?

It is owned by the State Highway Agency.