US Bridges

Snwdn-Chambers Rd. over Blacks Slough

Good

Montgomery County, Alabama · 3 Miles East of CO.61 · Structure no. 012557

Built
1981
44 years old
Condition
Good
inspected June 2024
Type
Channel Beam
Concrete
Length
120 ft
5 main spans
Daily traffic
400
1989 count
Owner
County
County Highway Agency

About this bridge

Snwdn-Chambers Rd. over Blacks Slough is a concrete channel beam carrying Snwdn-Chambers Rd. over Blacks Slough in Montgomery County, Alabama. It was built in 1981, so it is 44 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 400 vehicles a day, roughly 1% of them trucks, projected to reach 1,000 by 2044. The structure is 120 ft (36.6 m) long and 29 ft wide.

Location

Open in Google Maps
CarriesSnwdn-Chambers Rd.
CrossesBlacks Slough
Location3 Miles East of CO.61
RouteCounty Highway 24
CountyMontgomery County
StateAlabama
Coordinates32.25133, -86.24317
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating80.8 US tons
Inventory rating48.5 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans5
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span24 ft (7.3 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck0 ft (0 m)

Traffic and service

Average daily traffic400 (1989)
Projected traffic1,000 by 2044
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed—
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$968,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Snwdn-Chambers Rd. over Blacks Slough built?

It was built in 1981, making it 44 years old in 2025.

What condition is Snwdn-Chambers Rd. over Blacks 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 June 2024.

How much traffic does Snwdn-Chambers Rd. over Blacks Slough carry?

About 400 vehicles per day (1989 count), of which roughly 1% are trucks.

How long is Snwdn-Chambers Rd. over Blacks Slough?

The structure is 120 ft (36.6 m) long with a longest span of 24 ft (7.3 m) and a deck 29 ft wide.

Who owns Snwdn-Chambers Rd. over Blacks Slough?

It is owned by the County Highway Agency.