US Bridges

Ag and Dnr Traffic over Prairie Creek

PoorPosted for load

Marion County, Iowa · Marion Co. S20 T77N R20 · Structure no. CEPNCRIA-000006

Built
1952
73 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
35 ft
1 main span
Daily traffic
1
2020 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

Ag and Dnr Traffic over Prairie Creek is a steel stringer/multi-beam or girder carrying Ag and Dnr Traffic over Prairie Creek in Marion County, Iowa. It was built in 1952, so it is 73 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. Its operating status is: posted for load restriction.

It carries about 1 vehicles a day, projected to reach 1 by 2042. The structure is 35 ft (10.6 m) long and 18 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesAg and Dnr Traffic
CrossesPrairie Creek
LocationMarion Co. S20 T77N R20
CountyMarion County
StateIowa
Coordinates41.45451, -93.18034
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating4.6 US tons
Inventory rating3.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length35 ft (10.6 m)
Longest span34 ft (10.3 m)
Deck width18 ft (5.4 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1 (2020)
Projected traffic1 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$106,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ag and Dnr Traffic over Prairie Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is Ag and Dnr Traffic over Prairie Creek 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 July 2024.

How much traffic does Ag and Dnr Traffic over Prairie Creek carry?

About 1 vehicles per day (2020 count).

How long is Ag and Dnr Traffic over Prairie Creek?

The structure is 35 ft (10.6 m) long with a longest span of 34 ft (10.3 m) and a deck 18 ft wide.

Who owns Ag and Dnr Traffic over Prairie Creek?

It is owned by the Corps of Engineers (Civil).