US Bridges

470th ST over Walnut & Wolf Branch

Good

Appanoose County, Iowa · 069180701 · Structure no. 000000000065431

Built
2018
7 years old
Condition
Good
inspected October 2020
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

470th ST over Walnut & Wolf Branch is a concrete continuous culvert carrying 470th ST over Walnut & Wolf Branch in Appanoose 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 50 vehicles a day, projected to reach 50 by 2043. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
Carries470th ST
CrossesWalnut & Wolf Branch
Location069180701
RouteCounty Highway 0
CountyAppanoose County
StateIowa
Coordinates40.79731, -92.9807
Functional classRural Minor Collector

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.
Culvert8 Very GoodNo problems noted.
Last inspectionOctober 2020
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating52.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHL 93
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic50 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 470th ST over Walnut & Wolf Branch built?

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

What condition is 470th ST over Walnut & Wolf 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 October 2020.

How much traffic does 470th ST over Walnut & Wolf Branch carry?

About 50 vehicles per day (2022 count).

How long is 470th ST over Walnut & Wolf Branch?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m).

Who owns 470th ST over Walnut & Wolf Branch?

It is owned by the County Highway Agency.