US Bridges

Johnston Street over Coulee Mine Br

Poor

Lafayette Parish, Louisiana · 0.3 Miles East of LA 3025 · Structure no. 032800800208171

Built
1958
67 years old
Condition
Poor
inspected December 2023
Type
Slab
Concrete
Length
80 ft
4 main spans
Daily traffic
29,320
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Johnston Street over Coulee Mine Br is a concrete slab carrying Johnston Street over Coulee Mine Br in Lafayette Parish, Louisiana. It was built in 1958, so it is 67 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 29,320 vehicles a day, roughly 10% of them trucks, projected to reach 32,252 by 2043. The structure is 80 ft (24.4 m) long and 65 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesJohnston Street
CrossesCoulee Mine Br
Location0.3 Miles East of LA 3025
RouteCity Street 0
Coordinates30.20902, -92.0344
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating32.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span20 ft (6.1 m)
Deck width65 ft (19.9 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,320 (2023)
Projected traffic32,252 by 2043
Trucks10%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$559,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Johnston Street over Coulee Mine Br built?

It was built in 1958, making it 67 years old in 2025.

What condition is Johnston Street over Coulee Mine Br in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2023.

How much traffic does Johnston Street over Coulee Mine Br carry?

About 29,320 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Johnston Street over Coulee Mine Br?

The structure is 80 ft (24.4 m) long with a longest span of 20 ft (6.1 m) and a deck 65 ft wide.

Who owns Johnston Street over Coulee Mine Br?

It is owned by the City or Municipal Highway Agency.