US Bridges

Ziegler Blvd. over Threemile Creek

Fair

Mobile County, Alabama · 1000 S. Forest Hill Dr. · Structure no. 010997

Built
1973
52 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
93 ft
7 main spans
Daily traffic
21,145
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Ziegler Blvd. over Threemile Creek is a concrete culvert carrying Ziegler Blvd. over Threemile Creek in Mobile County, Alabama. It was built in 1973, so it is 52 years old, older 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 5 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 21,145 vehicles a day, roughly 2% of them trucks, projected to reach 31,717 by 2043. The structure is 93 ft (28.3 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesZiegler Blvd.
CrossesThreemile Creek
Location1000 S. Forest Hill Dr.
RouteCity Street 0
CountyMobile County
StateAlabama
Coordinates30.70631, -88.15136
Functional classUrban Minor Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: 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 rating63.8 US tons
Inventory rating38.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans7
Design loadH 15
Structure length93 ft (28.3 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,145 (2023)
Projected traffic31,717 by 2043
Trucks2%
Lanes on structure5
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ziegler Blvd. over Threemile Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is Ziegler Blvd. over Threemile Creek 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 October 2023.

How much traffic does Ziegler Blvd. over Threemile Creek carry?

About 21,145 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Ziegler Blvd. over Threemile Creek?

The structure is 93 ft (28.3 m) long with a longest span of 12 ft (3.7 m).

Who owns Ziegler Blvd. over Threemile Creek?

It is owned by the City or Municipal Highway Agency.