US Bridges

Narrow Lane RD over Baldwin Slough

Fair

Montgomery County, Alabama · 0.4 Mi.S.Of Seibels RD · Structure no. 011236

Built
1974
51 years old
Condition
Fair
inspected July 2023
Type
Channel Beam
Concrete
Length
264 ft
11 main spans
Daily traffic
500
1992 count
Owner
City
City or Municipal Highway Agency

About this bridge

Narrow Lane RD over Baldwin Slough is a concrete channel beam carrying Narrow Lane RD over Baldwin Slough in Montgomery 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 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 500 vehicles a day, roughly 2% of them trucks, projected to reach 1,000 by 2043. The structure is 264 ft (80.5 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesNarrow Lane RD
CrossesBaldwin Slough
Location0.4 Mi.S.Of Seibels RD
RouteCounty Highway 39
CountyMontgomery County
StateAlabama
Coordinates32.30263, -86.27652
Functional classUrban Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment7: Better than present minimum criteria
Operating rating64.2 US tons
Inventory rating38.4 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans11
Design loadH 15
Structure length264 ft (80.5 m)
Longest span24 ft (7.3 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (1992)
Projected traffic1,000 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.7 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Narrow Lane RD over Baldwin Slough built?

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

What condition is Narrow Lane RD over Baldwin Slough 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 July 2023.

How much traffic does Narrow Lane RD over Baldwin Slough carry?

About 500 vehicles per day (1992 count), of which roughly 2% are trucks.

How long is Narrow Lane RD over Baldwin Slough?

The structure is 264 ft (80.5 m) long with a longest span of 24 ft (7.3 m) and a deck 26 ft wide.

Who owns Narrow Lane RD over Baldwin Slough?

It is owned by the City or Municipal Highway Agency.