US Bridges

Mulberry Avenue over Lonzo Creek

Fair

Adams County, Iowa · 071333202 · Structure no. 000000000059011

Built
1978
47 years old, rebuilt 2016
Condition
Fair
inspected January 2023
Type
Tee Beam
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

Mulberry Avenue over Lonzo Creek is a prestressed concrete tee beam carrying Mulberry Avenue over Lonzo Creek in Adams County, Iowa. It was built in 1978 and reconstructed in 2016, so it is 47 years old, older than the Iowa average of 45.5 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 26 vehicles a day, projected to reach 26 by 2043. The structure is 36 ft (11 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMulberry Avenue
CrossesLonzo Creek
Location071333202
RouteCounty Highway 0
CountyAdams County
StateIowa
Coordinates40.90086, -94.68063
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span35 ft (10.7 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mulberry Avenue over Lonzo Creek built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2016.

What condition is Mulberry Avenue over Lonzo 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 January 2023.

How much traffic does Mulberry Avenue over Lonzo Creek carry?

About 26 vehicles per day (2022 count).

How long is Mulberry Avenue over Lonzo Creek?

The structure is 36 ft (11 m) long with a longest span of 35 ft (10.7 m) and a deck 24 ft wide.

Who owns Mulberry Avenue over Lonzo Creek?

It is owned by the County Highway Agency.