US Bridges

West 15th Avenue over Mile Branch

Good

St. Tammany Parish, Louisiana · 0.37 Mi.W of LA.21 · Structure no. 625200000620329

Built
2017
8 years old
Condition
Good
inspected March 2023
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
800
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

West 15th Avenue over Mile Branch is a concrete slab carrying West 15th Avenue over Mile Branch in St. Tammany Parish, Louisiana. It was built in 2017, so it is 8 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 800 vehicles a day, projected to reach 880 by 2036. The structure is 100 ft (30.5 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWest 15th Avenue
CrossesMile Branch
Location0.37 Mi.W of LA.21
RouteCounty Highway 0
CountySt. Tammany Parish
StateLouisiana
Coordinates30.47641, -90.11566
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.2 US tons
Inventory rating47.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadGreater than HL 93
Structure length100 ft (30.5 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2016)
Projected traffic880 by 2036
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 West 15th Avenue over Mile Branch built?

It was built in 2017, making it 8 years old in 2025.

What condition is West 15th Avenue over Mile Branch 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 March 2023.

How much traffic does West 15th Avenue over Mile Branch carry?

About 800 vehicles per day (2016 count).

How long is West 15th Avenue over Mile Branch?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns West 15th Avenue over Mile Branch?

It is owned by the City or Municipal Highway Agency.