US Bridges

L Ave over Black Hawk Creek

Good

Grundy County, Iowa · 088171102 · Structure no. 000000000366785

Built
2022
3 years old
Condition
Good
inspected April 2023
Type
Culvert
Steel
Length
28 ft
3 main spans
Daily traffic
33
2022 count
Owner
County
County Highway Agency

About this bridge

L Ave over Black Hawk Creek is a steel culvert carrying L Ave over Black Hawk Creek in Grundy County, Iowa. It was built in 2022, so it is 3 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 33 vehicles a day, projected to reach 33 by 2043. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesL Ave
CrossesBlack Hawk Creek
Location088171102
RouteCounty Highway 0
CountyGrundy County
StateIowa
Coordinates42.44613, -92.80766
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert9 ExcellentNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span7 ft (2.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33 (2022)
Projected traffic33 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 L Ave over Black Hawk Creek built?

It was built in 2022, making it 3 years old in 2025.

What condition is L Ave over Black Hawk Creek 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 April 2023.

How much traffic does L Ave over Black Hawk Creek carry?

About 33 vehicles per day (2022 count).

How long is L Ave over Black Hawk Creek?

The structure is 28 ft (8.5 m) long with a longest span of 7 ft (2.1 m).

Who owns L Ave over Black Hawk Creek?

It is owned by the County Highway Agency.