US Bridges

Flag Lake Bridge over Flag Lake Spillway

Fair

Bossier Parish, Louisiana · 0.8 MI E of Range Road · Structure no. AFLAAWUB06898

Built
1997
28 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete
Length
76 ft
3 main spans
Daily traffic
200
2016 count
Owner
Federal
Air Force

About this bridge

Flag Lake Bridge over Flag Lake Spillway is a concrete culvert carrying Flag Lake Bridge over Flag Lake Spillway in Bossier Parish, Louisiana. It was built in 1997, so it is 28 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 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 200 vehicles a day, projected to reach 240 by 2036. The structure is 76 ft (23.2 m) long and 16 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesFlag Lake Bridge
CrossesFlag Lake Spillway
Location0.8 MI E of Range Road
CountyBossier Parish
StateLouisiana
Coordinates32.50542, -93.58807
Functional classUrban 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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length76 ft (23.2 m)
Longest span24 ft (7.3 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2016)
Projected traffic240 by 2036
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerAir Force
Maintained byAir Force
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 Flag Lake Bridge over Flag Lake Spillway built?

It was built in 1997, making it 28 years old in 2025.

What condition is Flag Lake Bridge over Flag Lake Spillway 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 November 2024.

How much traffic does Flag Lake Bridge over Flag Lake Spillway carry?

About 200 vehicles per day (2016 count).

How long is Flag Lake Bridge over Flag Lake Spillway?

The structure is 76 ft (23.2 m) long with a longest span of 24 ft (7.3 m) and a deck 16 ft wide.

Who owns Flag Lake Bridge over Flag Lake Spillway?

It is owned by the Air Force.