US Bridges

CO 170 over Six Mile Creek

Fair

Lauderdale County, Alabama · 1.4 MI SE CO 25 · Structure no. 011284

Built
1974
51 years old
Condition
Fair
inspected February 2025
Type
Channel Beam
Concrete
Length
48 ft
2 main spans
Daily traffic
140
1989 count
Owner
County
County Highway Agency

About this bridge

CO 170 over Six Mile Creek is a concrete channel beam carrying CO 170 over Six Mile Creek in Lauderdale County, Alabama. It was built in 1974, so it is 51 years old, younger than the Alabama average of 51.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 140 vehicles a day, roughly 10% of them trucks, projected to reach 280 by 2030. The structure is 48 ft (14.6 m) long and 25 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCO 170
CrossesSix Mile Creek
Location1.4 MI SE CO 25
RouteCounty Highway 170
CountyLauderdale County
StateAlabama
Coordinates34.88448, -87.50615
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating26.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadH 15
Structure length48 ft (14.6 m)
Longest span24 ft (7.3 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (1989)
Projected traffic280 by 2030
Trucks10%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$404,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CO 170 over Six Mile Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is CO 170 over Six Mile Creek 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 February 2025.

How much traffic does CO 170 over Six Mile Creek carry?

About 140 vehicles per day (1989 count), of which roughly 10% are trucks.

How long is CO 170 over Six Mile Creek?

The structure is 48 ft (14.6 m) long with a longest span of 24 ft (7.3 m) and a deck 25 ft wide.

Who owns CO 170 over Six Mile Creek?

It is owned by the County Highway Agency.