US Bridges

Monroe Ave over Big Spring Lagoon

Good

Madison County, Alabama · 1.0 Mile North US 431 · Structure no. 019391

Built
2004
21 years old
Condition
Good
inspected May 2023
Type
Arch - Deck
Concrete
Length
48 ft
1 main span
Daily traffic
4,200
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Monroe Ave over Big Spring Lagoon is a concrete arch - deck carrying Monroe Ave over Big Spring Lagoon in Madison County, Alabama. It was built in 2004, so it is 21 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 4,200 vehicles a day, roughly 1% of them trucks, projected to reach 6,000 by 2040. The structure is 48 ft (14.6 m) long and 80 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMonroe Ave
CrossesBig Spring Lagoon
Location1.0 Mile North US 431
RouteCity Street 0
CountyMadison County
StateAlabama
Coordinates34.725, -86.59
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.6 US tons
Inventory rating37.4 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length48 ft (14.6 m)
Longest span48 ft (14.6 m)
Deck width80 ft (24.4 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (2020)
Projected traffic6,000 by 2040
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$1.3 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Monroe Ave over Big Spring Lagoon built?

It was built in 2004, making it 21 years old in 2025.

What condition is Monroe Ave over Big Spring Lagoon 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 May 2023.

How much traffic does Monroe Ave over Big Spring Lagoon carry?

About 4,200 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Monroe Ave over Big Spring Lagoon?

The structure is 48 ft (14.6 m) long with a longest span of 48 ft (14.6 m) and a deck 80 ft wide.

Who owns Monroe Ave over Big Spring Lagoon?

It is owned by the City or Municipal Highway Agency.