US Bridges

LA3170 over Chatlin Lake Canal

Fair

Rapides Parish, Louisiana · 2.08 Mi. East of US 71 · Structure no. 084008403502081

Built
1963
62 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete
Length
175 ft
7 main spans
Daily traffic
7,317
2021 count
Owner
State
State Highway Agency

About this bridge

LA3170 over Chatlin Lake Canal is a concrete slab carrying LA3170 over Chatlin Lake Canal in Rapides Parish, Louisiana. It was built in 1963, so it is 62 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 7,317 vehicles a day, roughly 14% of them trucks, projected to reach 8,048 by 2041. The structure is 175 ft (53.3 m) long and 30 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesLA3170
CrossesChatlin Lake Canal
Location2.08 Mi. East of US 71
RouteState Highway 3170
CountyRapides Parish
StateLouisiana
Coordinates31.17959, -92.3834
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating44.6 US tons
Inventory rating34.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length175 ft (53.3 m)
Longest span25 ft (7.6 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,317 (2021)
Projected traffic8,048 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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$799,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA3170 over Chatlin Lake Canal built?

It was built in 1963, making it 62 years old in 2025.

What condition is LA3170 over Chatlin Lake Canal in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2024.

How much traffic does LA3170 over Chatlin Lake Canal carry?

About 7,317 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA3170 over Chatlin Lake Canal?

The structure is 175 ft (53.3 m) long with a longest span of 25 ft (7.6 m) and a deck 30 ft wide.

Who owns LA3170 over Chatlin Lake Canal?

It is owned by the State Highway Agency.