US Bridges

Carter Hill Road over Marks Slough

Good

Montgomery County, Alabama · 5 MI N of US 82 · Structure no. 012362

Built
1980
45 years old
Condition
Good
inspected August 2023
Type
Channel Beam
Concrete
Length
96 ft
5 main spans
Daily traffic
425
1988 count
Owner
County
County Highway Agency

About this bridge

Carter Hill Road over Marks Slough is a concrete channel beam carrying Carter Hill Road over Marks Slough in Montgomery County, Alabama. It was built in 1980, so it is 45 years old, younger than the Alabama average of 51.1 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 425 vehicles a day, roughly 1% of them trucks, projected to reach 1,000 by 2041. The structure is 96 ft (29.3 m) long and 26 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesCarter Hill Road
CrossesMarks Slough
Location5 MI N of US 82
RouteCounty Highway 12
CountyMontgomery County
StateAlabama
Coordinates32.2502, -86.09617
Functional classRural Major Collector

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.7 US tons
Inventory rating45.4 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans5
Design loadHS 20
Structure length96 ft (29.3 m)
Longest span24 ft (7.3 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic425 (1988)
Projected traffic1,000 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed16.2 mi (26 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 proposedNone recorded
Estimated improvement cost$723,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Carter Hill Road over Marks Slough built?

It was built in 1980, making it 45 years old in 2025.

What condition is Carter Hill Road over Marks Slough 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 August 2023.

How much traffic does Carter Hill Road over Marks Slough carry?

About 425 vehicles per day (1988 count), of which roughly 1% are trucks.

How long is Carter Hill Road over Marks Slough?

The structure is 96 ft (29.3 m) long with a longest span of 24 ft (7.3 m) and a deck 26 ft wide.

Who owns Carter Hill Road over Marks Slough?

It is owned by the County Highway Agency.