US Bridges

Sawmill RD over I-10

Good

St. Martin Parish, Louisiana · 2.2 MI West of LA 347 · Structure no. 035004500600001

Built
1970
55 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
234 ft
3 main spans
Daily traffic
60,066
2015 count
Owner
State
State Highway Agency

About this bridge

Sawmill RD over I-10 is a prestressed concrete stringer/multi-beam or girder carrying Sawmill RD over I-10 in St. Martin Parish, Louisiana. It was built in 1970, so it is 55 years old, older 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 60,066 vehicles a day, roughly 14% of them trucks, projected to reach 66,072 by 2035. The structure is 234 ft (71.3 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSawmill RD
CrossesI-10
Location2.2 MI West of LA 347
RouteCounty Highway 0
CountySt. Martin Parish
StateLouisiana
Coordinates30.28072, -91.94988
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating22.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+1 approach)
Design loadHS 20
Structure length234 ft (71.3 m)
Longest span73 ft (22.3 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60,066 (2015)
Projected traffic66,072 by 2035
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sawmill RD over I-10 built?

It was built in 1970, making it 55 years old in 2025.

What condition is Sawmill RD over I-10 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 May 2024.

How much traffic does Sawmill RD over I-10 carry?

About 60,066 vehicles per day (2015 count), of which roughly 14% are trucks.

How long is Sawmill RD over I-10?

The structure is 234 ft (71.3 m) long with a longest span of 73 ft (22.3 m) and a deck 30 ft wide.

Who owns Sawmill RD over I-10?

It is owned by the State Highway Agency.