US Bridges

Willis Ave over Frog Creek

Good

Dallas County, Iowa · 0.2 Miles West of 1st Ave · Structure no. 000000000503846

Built
2018
7 years old
Condition
Good
inspected March 2023
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
31 ft
1 main span
Daily traffic
2,269
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Willis Ave over Frog Creek is a aluminum, wrought iron, or cast iron culvert carrying Willis Ave over Frog Creek in Dallas County, Iowa. It was built in 2018, so it is 7 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,269 vehicles a day, projected to reach 2,269 by 2043. The structure is 31 ft (9.6 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesWillis Ave
CrossesFrog Creek
Location0.2 Miles West of 1st Ave
RouteCity Street 0
StateIowa
Coordinates41.83848, -94.11135
Functional classUrban Minor Arterial

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.
Culvert8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating42.1 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans1
Design loadHL 93
Structure length31 ft (9.6 m)
Longest span31 ft (9.6 m)
Deck width31 ft (9.4 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,269 (2022)
Projected traffic2,269 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Willis Ave over Frog Creek built?

It was built in 2018, making it 7 years old in 2025.

What condition is Willis Ave over Frog 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 March 2023.

How much traffic does Willis Ave over Frog Creek carry?

About 2,269 vehicles per day (2022 count).

How long is Willis Ave over Frog Creek?

The structure is 31 ft (9.6 m) long with a longest span of 31 ft (9.6 m) and a deck 31 ft wide.

Who owns Willis Ave over Frog Creek?

It is owned by the City or Municipal Highway Agency.