US Bridges

Coy RD over Flat River

Fair

Bossier Parish, Louisiana · 2.8 M W Parish RD 27 · Structure no. 040832342933841

Built
1989
36 years old
Condition
Fair
inspected December 2024
Type
Culvert
Steel
Length
92 ft
6 main spans
Daily traffic
613
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Coy RD over Flat River is a steel culvert carrying Coy RD over Flat River in Bossier Parish, Louisiana. It was built in 1989, so it is 36 years old, younger than the Louisiana average of 43 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.

It carries about 613 vehicles a day, projected to reach 674 by 2041. The structure is 92 ft (28 m) long and 106 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCoy RD
CrossesFlat River
Location2.8 M W Parish RD 27
RouteCounty Highway 0
CountyBossier Parish
StateLouisiana
Coordinates32.57053, -93.64056
Functional classUrban 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
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
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating82.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans6
Design loadHS 20
Structure length92 ft (28 m)
Longest span12 ft (3.7 m)
Deck width106 ft (32.3 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic613 (2021)
Projected traffic674 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Coy RD over Flat River built?

It was built in 1989, making it 36 years old in 2025.

What condition is Coy RD over Flat River 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 December 2024.

How much traffic does Coy RD over Flat River carry?

About 613 vehicles per day (2021 count).

How long is Coy RD over Flat River?

The structure is 92 ft (28 m) long with a longest span of 12 ft (3.7 m) and a deck 106 ft wide.

Who owns Coy RD over Flat River?

It is owned by the City or Municipal Highway Agency.