US Bridges

FM - Dallas over Troublesome River

PoorPosted for load

Cass County, Iowa · 077352101 · Structure no. 000000000100770

Built
1959
66 years old
Condition
Poor
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
170 ft
3 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

FM - Dallas over Troublesome River is a prestressed concrete stringer/multi-beam or girder carrying FM - Dallas over Troublesome River in Cass County, Iowa. It was built in 1959, so it is 66 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 other load-capacity restriction.

It carries about 20 vehicles a day, projected to reach 20 by 2044. The structure is 170 ft (51.8 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFM - Dallas
CrossesTroublesome River
Location077352101
RouteCounty Highway 0
CountyCass County
StateIowa
Coordinates41.46114, -94.88744
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.5 US tons
Inventory rating16.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length170 ft (51.8 m)
Longest span56 ft (17.1 m)
Deck width22 ft (6.6 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$1.6 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM - Dallas over Troublesome River built?

It was built in 1959, making it 66 years old in 2025.

What condition is FM - Dallas over Troublesome 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 March 2024.

How much traffic does FM - Dallas over Troublesome River carry?

About 20 vehicles per day (2022 count).

How long is FM - Dallas over Troublesome River?

The structure is 170 ft (51.8 m) long with a longest span of 56 ft (17.1 m) and a deck 22 ft wide.

Who owns FM - Dallas over Troublesome River?

It is owned by the County Highway Agency.