FM over Unnamed Stream

Poor

Ida County, Iowa · 089390102 · Structure no. 000000000187270

Built: 1961; 64 years old
Condition: Poor; inspected March 2023
Type: Slab; Concrete Continuous
Length: 78 ft; 3 main spans
Daily traffic: 379; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Unnamed Stream is a concrete continuous slab carrying FM over Unnamed Stream in Ida County, Iowa. It was built in 1961, so it is 64 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 379 vehicles a day, roughly 34% of them trucks, projected to reach 379 by 2043. The structure is 78 ft (23.8 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesFM

CrossesUnnamed Stream

Location089390102

RouteCounty Highway 0

CountyIda County

StateIowa

Coordinates42.55969, -95.40764

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.

Component	Rating	Meaning
Deck	4 Poor	Advanced section loss, deterioration, spalling or scour.
Superstructure	4 Poor	Advanced section loss, deterioration, spalling or scour.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionMarch 2023

Inspection intervalevery 24 months

Operating statusOpen, no 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 adequacy6: Equal to present minimum criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating40.8 US tons

Inventory rating24.4 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 15

Structure length78 ft (23.8 m)

Longest span29 ft (8.8 m)

Deck width26 ft (8 m)

Roadway width24 ft (7.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic379 (2022)

Projected traffic379 by 2043

Trucks34%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed1.9 mi (3 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 FM over Unnamed Stream built?

It was built in 1961, making it 64 years old in 2025.

What condition is FM over Unnamed Stream 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 2023.

How much traffic does FM over Unnamed Stream carry?

About 379 vehicles per day (2022 count), of which roughly 34% are trucks.

How long is FM over Unnamed Stream?

The structure is 78 ft (23.8 m) long with a longest span of 29 ft (8.8 m) and a deck 26 ft wide.

Who owns FM over Unnamed Stream?

It is owned by the County Highway Agency.