US Bridges

Walnut Avenue over Stream

Poor

Adams County, Iowa · 073322604 · Structure no. 000000000060460

Built
1967
58 years old
Condition
Poor
inspected February 2024
Type
Tee Beam
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
71
2022 count
Owner
County
County Highway Agency

About this bridge

Walnut Avenue over Stream is a prestressed concrete tee beam carrying Walnut Avenue over Stream in Adams County, Iowa. It was built in 1967, so it is 58 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 71 vehicles a day, projected to reach 71 by 2044. The structure is 41 ft (12.5 m) long and 20 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesWalnut Avenue
CrossesStream
Location073322604
RouteCounty Highway 0
CountyAdams County
StateIowa
Coordinates41.09525, -94.49937
Functional classRural Local

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 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
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.6 US tons
Inventory rating29.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span39 ft (11.9 m)
Deck width20 ft (6.2 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2022)
Projected traffic71 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$475,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Walnut Avenue over Stream built?

It was built in 1967, making it 58 years old in 2025.

What condition is Walnut Avenue over Stream 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 February 2024.

How much traffic does Walnut Avenue over Stream carry?

About 71 vehicles per day (2022 count).

How long is Walnut Avenue over Stream?

The structure is 41 ft (12.5 m) long with a longest span of 39 ft (11.9 m) and a deck 20 ft wide.

Who owns Walnut Avenue over Stream?

It is owned by the County Highway Agency.