US Bridges

Hidden Lake over Unknown Tributary

Fair

Madison County, Alabama · Hidden Lake and Mossy Pt. · Structure no. 018545

Built
2001
24 years old
Condition
Fair
inspected August 2023
Type
Culvert
Concrete
Length
39 ft
3 main spans
Daily traffic
500
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hidden Lake over Unknown Tributary is a concrete culvert carrying Hidden Lake over Unknown Tributary in Madison County, Alabama. It was built in 2001, so it is 24 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 1% of them trucks, projected to reach 725 by 2043. The structure is 39 ft (11.9 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesHidden Lake
CrossesUnknown Tributary
LocationHidden Lake and Mossy Pt.
RouteCity Street 0
CountyMadison County
StateAlabama
Coordinates34.62611, -86.495
Functional classUrban 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.8 US tons
Inventory rating41.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span12 ft (3.7 m)
Deck width50 ft (15.2 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deck0 ft (0 m)

Traffic and service

Average daily traffic500 (2021)
Projected traffic725 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost$592,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Hidden Lake over Unknown Tributary built?

It was built in 2001, making it 24 years old in 2025.

What condition is Hidden Lake over Unknown Tributary 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 August 2023.

How much traffic does Hidden Lake over Unknown Tributary carry?

About 500 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Hidden Lake over Unknown Tributary?

The structure is 39 ft (11.9 m) long with a longest span of 12 ft (3.7 m) and a deck 50 ft wide.

Who owns Hidden Lake over Unknown Tributary?

It is owned by the City or Municipal Highway Agency.