US Bridges

St. Mary Road over Tangipahoa River

Good

Pike County, Mississippi · Sec 11 T 1N R 7E B · Structure no. SA570000000A009

Built
2013
12 years old
Condition
Good
inspected April 2024
Type
Truss - Thru
Steel
Length
141 ft
1 main span
Daily traffic
99
2022 count
Owner
County
County Highway Agency

About this bridge

St. Mary Road over Tangipahoa River is a steel truss - thru carrying St. Mary Road over Tangipahoa River in Pike County, Mississippi. It was built in 2013, so it is 12 years old, younger than the Mississippi average of 38.9 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 99 vehicles a day, projected to reach 150 by 2044. The structure is 141 ft (42.9 m) long and 30 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSt. Mary Road
CrossesTangipahoa River
LocationSec 11 T 1N R 7E B
RouteCounty Highway 89
CountyPike County
StateMississippi
Coordinates31.06042, -90.47167
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating45.3 US tons
Inventory rating35.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length141 ft (42.9 m)
Longest span135 ft (41.1 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic99 (2022)
Projected traffic150 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$940,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was St. Mary Road over Tangipahoa River built?

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

What condition is St. Mary Road over Tangipahoa 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 April 2024.

How much traffic does St. Mary Road over Tangipahoa River carry?

About 99 vehicles per day (2022 count).

How long is St. Mary Road over Tangipahoa River?

The structure is 141 ft (42.9 m) long with a longest span of 135 ft (41.1 m) and a deck 30 ft wide.

Who owns St. Mary Road over Tangipahoa River?

It is owned by the County Highway Agency.