US Bridges

ST Clair CO Hw 78 over Broken Arrow Creek

Fair

St. Clair County, Alabama · 0.6 MI N Harkeys Chap.Ch. · Structure no. 003375

Built
1994
31 years old
Condition
Fair
inspected December 2024
Type
Channel Beam
Concrete
Length
102 ft
3 main spans
Daily traffic
450
1999 count
Owner
County
County Highway Agency

About this bridge

ST Clair CO Hw 78 over Broken Arrow Creek is a concrete channel beam carrying ST Clair CO Hw 78 over Broken Arrow Creek in St. Clair County, Alabama. It was built in 1994, so it is 31 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 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 450 vehicles a day, roughly 90% of them trucks, projected to reach 858 by 2029. The structure is 102 ft (31.1 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesST Clair CO Hw 78
CrossesBroken Arrow Creek
Location0.6 MI N Harkeys Chap.Ch.
RouteCounty Highway 78
StateAlabama
Coordinates33.67295, -86.25671
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating83.3 US tons
Inventory rating50 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length102 ft (31.1 m)
Longest span34 ft (10.4 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (1999)
Projected traffic858 by 2029
Trucks90%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$717,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST Clair CO Hw 78 over Broken Arrow Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is ST Clair CO Hw 78 over Broken Arrow 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 December 2024.

How much traffic does ST Clair CO Hw 78 over Broken Arrow Creek carry?

About 450 vehicles per day (1999 count), of which roughly 90% are trucks.

How long is ST Clair CO Hw 78 over Broken Arrow Creek?

The structure is 102 ft (31.1 m) long with a longest span of 34 ft (10.4 m) and a deck 24 ft wide.

Who owns ST Clair CO Hw 78 over Broken Arrow Creek?

It is owned by the County Highway Agency.