US Bridges

Old Br.Rd. over Prairie Creek

PoorClosed to traffic

Linn County, Iowa · 082081204 · Structure no. 000000000220430

Built
1906
119 years old, rebuilt 1989
Condition
Poor
inspected September 2024
Type
Truss - Thru
Aluminum, Wrought Iron, or Cast Iron
Length
102 ft
1 main span
Daily traffic
110
2021 count
Owner
County
County Highway Agency

About this bridge

Old Br.Rd. over Prairie Creek is a aluminum, wrought iron, or cast iron truss - thru carrying Old Br.Rd. over Prairie Creek in Linn County, Iowa. It was built in 1906 and reconstructed in 1989, so it is 119 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 2 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: closed to all traffic.

It carries about 110 vehicles a day, projected to reach 110 by 2043. The structure is 102 ft (31.1 m) long and 14 ft wide.

CarriesOld Br.Rd.
CrossesPrairie Creek
Location082081204
RouteCounty Highway 0
StateIowa
Coordinates41.92299, -91.73042
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusClosed to all traffic
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry0: Immediate repair necessary to put back in service
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeTruss - Thru
MaterialAluminum, Wrought Iron, or Cast Iron
DeckWood or timber
Main spans1
Design loadHL 93
Structure length102 ft (31.1 m)
Longest span100 ft (30.5 m)
Deck width14 ft (4.4 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deck15 ft (4.6 m)

Traffic and service

Average daily traffic110 (2021)
Projected traffic110 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Br.Rd. over Prairie Creek built?

It was built in 1906, making it 119 years old in 2025. It was reconstructed in 1989.

What condition is Old Br.Rd. 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 September 2024.

How much traffic does Old Br.Rd. over Prairie Creek carry?

About 110 vehicles per day (2021 count).

How long is Old Br.Rd. over Prairie Creek?

The structure is 102 ft (31.1 m) long with a longest span of 100 ft (30.5 m) and a deck 14 ft wide.

Who owns Old Br.Rd. over Prairie Creek?

It is owned by the County Highway Agency.