US Bridges

Darby RD (CR-578A) over Stanley Brook

Good

Pasco County, Florida · 1.8MI East of I-75 · Structure no. 144028

Built
1970
55 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
800
2024 count
Owner
County
County Highway Agency

About this bridge

Darby RD (CR-578A) over Stanley Brook is a concrete culvert carrying Darby RD (CR-578A) over Stanley Brook in Pasco County, Florida. It was built in 1970, so it is 55 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 800 vehicles a day, roughly 9% of them trucks, projected to reach 1,388 by 2044. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesDarby RD (CR-578A)
CrossesStanley Brook
Location1.8MI East of I-75
RouteCounty Highway 578A
CountyPasco County
StateFlorida
Coordinates28.35414, -82.28953
Functional classRural Minor Collector

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.2 US tons
Inventory rating55.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length21 ft (6.4 m)
Longest span10 ft (3.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2024)
Projected traffic1,388 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Darby RD (CR-578A) over Stanley Brook built?

It was built in 1970, making it 55 years old in 2025.

What condition is Darby RD (CR-578A) over Stanley Brook 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 2024.

How much traffic does Darby RD (CR-578A) over Stanley Brook carry?

About 800 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Darby RD (CR-578A) over Stanley Brook?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3.2 m).

Who owns Darby RD (CR-578A) over Stanley Brook?

It is owned by the County Highway Agency.