US Bridges

County Road 120 over Mahan Creek

Good

Chilton County, Alabama · CR120 1M N.W.Mars Hill Ch · Structure no. 020165

Built
2008
17 years old
Condition
Good
inspected November 2023
Type
Channel Beam
Concrete
Length
40 ft
1 main span
Daily traffic
100
2008 count
Owner
County
County Highway Agency

About this bridge

County Road 120 over Mahan Creek is a concrete channel beam carrying County Road 120 over Mahan Creek in Chilton County, Alabama. It was built in 2008, so it is 17 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, projected to reach 375 by 2030. The structure is 40 ft (12.2 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCounty Road 120
CrossesMahan Creek
LocationCR120 1M N.W.Mars Hill Ch
RouteCounty Highway 120
CountyChilton County
StateAlabama
Coordinates32.96327, -86.8303
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating83.1 US tons
Inventory rating49.9 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2008)
Projected traffic375 by 2030
Trucks0%
Lanes on structure2
Traffic directionTwo-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$385,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 120 over Mahan Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is County Road 120 over Mahan Creek 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 November 2023.

How much traffic does County Road 120 over Mahan Creek carry?

About 100 vehicles per day (2008 count).

How long is County Road 120 over Mahan Creek?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 28 ft wide.

Who owns County Road 120 over Mahan Creek?

It is owned by the County Highway Agency.