US Bridges

Medford Ave over Willow River

PoorPosted for load

Harrison County, Iowa · 079432102 · Structure no. 000000000178170

Built
1900
125 years old
Condition
Poor
inspected December 2022
Type
Truss - Thru
Steel
Length
191 ft
1 main span
Daily traffic
89
2022 count
Owner
County
County Highway Agency

About this bridge

Medford Ave over Willow River is a steel truss - thru carrying Medford Ave over Willow River in Harrison County, Iowa. It was built in 1900, so it is 125 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 3 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. Its operating status is: posted for load restriction.

It carries about 89 vehicles a day, projected to reach 89 by 2043. The structure is 191 ft (58.2 m) long and 18 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesMedford Ave
CrossesWillow River
Location079432102
RouteCounty Highway 0
StateIowa
Coordinates41.63623, -95.86677
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.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating7.6 US tons
Inventory rating4.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20
Structure length191 ft (58.2 m)
Longest span189 ft (57.6 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deck11 ft (3.4 m)

Traffic and service

Average daily traffic89 (2022)
Projected traffic89 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Medford Ave over Willow River built?

It was built in 1900, making it 125 years old in 2025.

What condition is Medford Ave over Willow River 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 December 2022.

How much traffic does Medford Ave over Willow River carry?

About 89 vehicles per day (2022 count).

How long is Medford Ave over Willow River?

The structure is 191 ft (58.2 m) long with a longest span of 189 ft (57.6 m) and a deck 18 ft wide.

Who owns Medford Ave over Willow River?

It is owned by the County Highway Agency.