US Bridges

Thomas ST over Middle Racoon River

Poor

Dallas County, Iowa · 078290400 · Structure no. 000000000009871

Built
1951
74 years old, rebuilt 1996
Condition
Poor
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
337 ft
4 main spans
Daily traffic
574
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Thomas ST over Middle Racoon River is a steel continuous stringer/multi-beam or girder carrying Thomas ST over Middle Racoon River in Dallas County, Iowa. It was built in 1951 and reconstructed in 1996, so it is 74 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 574 vehicles a day, roughly 11% of them trucks, projected to reach 574 by 2043. The structure is 337 ft (102.7 m) long and 30 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesThomas ST
CrossesMiddle Racoon River
Location078290400
RouteCity Street 0
StateIowa
Coordinates41.59013, -94.20356
Functional classRural Major Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.9 US tons
Inventory rating25.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length337 ft (102.7 m)
Longest span94 ft (28.7 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic574 (2022)
Projected traffic574 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Thomas ST over Middle Racoon River built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1996.

What condition is Thomas ST over Middle Racoon 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 January 2023.

How much traffic does Thomas ST over Middle Racoon River carry?

About 574 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is Thomas ST over Middle Racoon River?

The structure is 337 ft (102.7 m) long with a longest span of 94 ft (28.7 m) and a deck 30 ft wide.

Who owns Thomas ST over Middle Racoon River?

It is owned by the City or Municipal Highway Agency.