US Bridges

CR-485 (cobb Rd) over Diesel Ditch

Good

Hernando County, Florida · At CR-485&SR-50 Junction · Structure no. 080027

Built
1950
75 years old, rebuilt 1999
Condition
Good
inspected February 2025
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
10,500
2025 count
Owner
State
State Highway Agency

About this bridge

CR-485 (cobb Rd) over Diesel Ditch is a concrete culvert carrying CR-485 (cobb Rd) over Diesel Ditch in Hernando County, Florida. It was built in 1950 and reconstructed in 1999, so it is 75 years old, older than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10,500 vehicles a day, roughly 5% of them trucks, projected to reach 18,220 by 2045. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 5.6 mi (9 km).

Location

Open in Google Maps
CarriesCR-485 (cobb Rd)
CrossesDiesel Ditch
LocationAt CR-485&SR-50 Junction
RouteCounty Highway 485
CountyHernando County
StateFlorida
Coordinates28.55279, -82.4207
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2025
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.5 US tons
Inventory rating25.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length21 ft (6.4 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 traffic10,500 (2025)
Projected traffic18,220 by 2045
Trucks5%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 CR-485 (cobb Rd) over Diesel Ditch built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1999.

What condition is CR-485 (cobb Rd) over Diesel Ditch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2025.

How much traffic does CR-485 (cobb Rd) over Diesel Ditch carry?

About 10,500 vehicles per day (2025 count), of which roughly 5% are trucks.

How long is CR-485 (cobb Rd) over Diesel Ditch?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns CR-485 (cobb Rd) over Diesel Ditch?

It is owned by the State Highway Agency.