US Bridges

Linn-Benton RD over Prairie Creek

FairPosted for load

Linn County, Iowa · 082080704 · Structure no. 000000000220400

Built
1947
78 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
183 ft
3 main spans
Daily traffic
140
2022 count
Owner
County
County Highway Agency

About this bridge

Linn-Benton RD over Prairie Creek is a steel continuous stringer/multi-beam or girder carrying Linn-Benton RD over Prairie Creek in Linn County, Iowa. It was built in 1947, so it is 78 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for other load-capacity restriction.

It carries about 140 vehicles a day, projected to reach 140 by 2044. The structure is 183 ft (55.8 m) long and 22 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesLinn-Benton RD
CrossesPrairie Creek
Location082080704
RouteCounty Highway 0
CountyLinn County
StateIowa
Coordinates41.92324, -91.83249
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating28.5 US tons
Inventory rating22.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length183 ft (55.8 m)
Longest span70 ft (21.3 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2022)
Projected traffic140 by 2044
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Linn-Benton RD over Prairie Creek built?

It was built in 1947, making it 78 years old in 2025.

What condition is Linn-Benton RD over Prairie Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does Linn-Benton RD over Prairie Creek carry?

About 140 vehicles per day (2022 count).

How long is Linn-Benton RD over Prairie Creek?

The structure is 183 ft (55.8 m) long with a longest span of 70 ft (21.3 m) and a deck 22 ft wide.

Who owns Linn-Benton RD over Prairie Creek?

It is owned by the County Highway Agency.