US Bridges

L23 Laredo Ave over Steer Creek

Poor

Harrison County, Iowa · .75 MI S of 147th on L23 · Structure no. 000000000366610

Built
1942
83 years old
Condition
Poor
inspected November 2024
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
139
2022 count
Owner
County
County Highway Agency

About this bridge

L23 Laredo Ave over Steer Creek is a concrete continuous culvert carrying L23 Laredo Ave over Steer Creek in Harrison County, Iowa. It was built in 1942, so it is 83 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 139 vehicles a day, roughly 18% of them trucks, projected to reach 139 by 2043. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesL23 Laredo Ave
CrossesSteer Creek
Location.75 MI S of 147th on L23
RouteCounty Highway 0
CountyHarrison County
StateIowa
Coordinates41.78377, -95.87595
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating48.9 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic139 (2022)
Projected traffic139 by 2043
Trucks18%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was L23 Laredo Ave over Steer Creek built?

It was built in 1942, making it 83 years old in 2025.

What condition is L23 Laredo Ave over Steer Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does L23 Laredo Ave over Steer Creek carry?

About 139 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is L23 Laredo Ave over Steer Creek?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns L23 Laredo Ave over Steer Creek?

It is owned by the County Highway Agency.