US Bridges

Gunn Highway over Unknown Waterway

Fair

Hillsborough County, Florida · 0.25MI N/O Country Run RD · Structure no. 104483

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
28,290
2023 count
Owner
County
County Highway Agency

About this bridge

Gunn Highway over Unknown Waterway is a concrete culvert carrying Gunn Highway over Unknown Waterway in Hillsborough 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 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 28,290 vehicles a day, roughly 10% of them trucks, projected to reach 35,365 by 2042. The structure is 21 ft (6.3 m) long.

CarriesGunn Highway
CrossesUnknown Waterway
Location0.25MI N/O Country Run RD
RouteCounty Highway 587
StateFlorida
Coordinates28.05408, -82.52656
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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating46.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length21 ft (6.3 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 traffic28,290 (2023)
Projected traffic35,365 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Gunn Highway over Unknown Waterway built?

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

What condition is Gunn Highway over Unknown Waterway 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 Gunn Highway over Unknown Waterway carry?

About 28,290 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Gunn Highway over Unknown Waterway?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m).

Who owns Gunn Highway over Unknown Waterway?

It is owned by the County Highway Agency.