US Bridges

135th Ave over Twister Branch

Good

Winnebago County, Iowa · 098242902 · Structure no. 000000000366171

Built
2023
2 years old
Condition
Good
inspected March 2024
Type
Culvert
Steel
Length
22 ft
2 main spans
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

135th Ave over Twister Branch is a steel culvert carrying 135th Ave over Twister Branch in Winnebago County, Iowa. It was built in 2023, so it is 2 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 11 vehicles a day, projected to reach 11 by 2044. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
Carries135th Ave
CrossesTwister Branch
Location098242902
RouteCounty Highway 0
CountyWinnebago County
StateIowa
Coordinates43.28287, -93.7058
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 protection8 Very GoodNo problems noted.
Culvert9 ExcellentNo problems noted.
Last inspectionMarch 2024
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 spans2
Design loadUnknown
Structure length22 ft (6.7 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 traffic11 (2022)
Projected traffic11 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 135th Ave over Twister Branch built?

It was built in 2023, making it 2 years old in 2025.

What condition is 135th Ave over Twister Branch 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 March 2024.

How much traffic does 135th Ave over Twister Branch carry?

About 11 vehicles per day (2022 count).

How long is 135th Ave over Twister Branch?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns 135th Ave over Twister Branch?

It is owned by the County Highway Agency.