US Bridges

Thorguson Dr. over Simmons Bayou

Good

St. Mary Parish, Louisiana · 0.7 MI S of US 90 · Structure no. 035100000200755

Built
2013
12 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete
Length
60 ft
3 main spans
Daily traffic
1,200
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Thorguson Dr. over Simmons Bayou is a concrete slab carrying Thorguson Dr. over Simmons Bayou in St. Mary Parish, Louisiana. It was built in 2013, so it is 12 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 1,200 vehicles a day, projected to reach 1,320 by 2042. The structure is 60 ft (18.3 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesThorguson Dr.
CrossesSimmons Bayou
Location0.7 MI S of US 90
RouteCounty Highway 0
CountySt. Mary Parish
StateLouisiana
Coordinates29.68004, -91.23437
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHL 93
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width33 ft (10 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2022)
Projected traffic1,320 by 2042
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

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Thorguson Dr. over Simmons Bayou built?

It was built in 2013, making it 12 years old in 2025.

What condition is Thorguson Dr. over Simmons Bayou 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 April 2023.

How much traffic does Thorguson Dr. over Simmons Bayou carry?

About 1,200 vehicles per day (2022 count).

How long is Thorguson Dr. over Simmons Bayou?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 33 ft wide.

Who owns Thorguson Dr. over Simmons Bayou?

It is owned by the Town or Township Highway Agency.