US Bridges

Swan Lake Rd.(n) over Flat River

Good

Bossier Parish, Louisiana · 5.1 MI N of I-220 · Structure no. 040800000040806

Built
2020
5 years old
Condition
Good
inspected December 2024
Type
Slab
Concrete
Length
120 ft
6 main spans
Daily traffic
2,792
2020 count
Owner
County
County Highway Agency

About this bridge

Swan Lake Rd.(n) over Flat River is a concrete slab carrying Swan Lake Rd.(n) over Flat River in Bossier Parish, Louisiana. It was built in 2020, so it is 5 years old, younger than the Louisiana average of 43 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 2,792 vehicles a day, projected to reach 3,071 by 2040. The structure is 120 ft (36.6 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSwan Lake Rd.(n)
CrossesFlat River
Location5.1 MI N of I-220
RouteCounty Highway 0
CountyBossier Parish
StateLouisiana
Coordinates32.61798, -93.69017
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating62.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans6
Design loadGreater than HL 93
Structure length120 ft (36.6 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,792 (2020)
Projected traffic3,071 by 2040
Trucks—
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 Swan Lake Rd.(n) over Flat River built?

It was built in 2020, making it 5 years old in 2025.

What condition is Swan Lake Rd.(n) over Flat River 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 December 2024.

How much traffic does Swan Lake Rd.(n) over Flat River carry?

About 2,792 vehicles per day (2020 count).

How long is Swan Lake Rd.(n) over Flat River?

The structure is 120 ft (36.6 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns Swan Lake Rd.(n) over Flat River?

It is owned by the County Highway Agency.