US Bridges

Rockridge Rd. over Mattress Drain

FairPosted for load

Polk County, Florida · 2.4 MI N of Dean Still RD · Structure no. 164144

Built
1960
65 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
36 ft
2 main spans
Daily traffic
186
2024 count
Owner
County
County Highway Agency

About this bridge

Rockridge Rd. over Mattress Drain is a prestressed concrete tee beam carrying Rockridge Rd. over Mattress Drain in Polk County, Florida. It was built in 1960, so it is 65 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 186 vehicles a day, roughly 3% of them trucks, projected to reach 323 by 2044. The structure is 36 ft (11.1 m) long and 24 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesRockridge Rd.
CrossesMattress Drain
Location2.4 MI N of Dean Still RD
RouteCounty Highway 0
CountyPolk County
StateFlorida
Coordinates28.28874, -81.9419
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating23.6 US tons
Inventory rating18.2 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length36 ft (11.1 m)
Longest span19 ft (5.7 m)
Deck width24 ft (7.2 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic186 (2024)
Projected traffic323 by 2044
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Rockridge Rd. over Mattress Drain built?

It was built in 1960, making it 65 years old in 2025.

What condition is Rockridge Rd. over Mattress Drain 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 Rockridge Rd. over Mattress Drain carry?

About 186 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Rockridge Rd. over Mattress Drain?

The structure is 36 ft (11.1 m) long with a longest span of 19 ft (5.7 m) and a deck 24 ft wide.

Who owns Rockridge Rd. over Mattress Drain?

It is owned by the County Highway Agency.