FM over Dry Run

Good

O'Brien County, Iowa · 095400605 · Structure no. 000000000259911

Built: 1998; 27 years old
Condition: Good; inspected June 2023
Type: Culvert; Concrete Continuous
Length: 29 ft; 2 main spans
Daily traffic: 1,168; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Dry Run is a concrete continuous culvert carrying FM over Dry Run in O'Brien County, Iowa. It was built in 1998, so it is 27 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,168 vehicles a day, roughly 11% of them trucks, projected to reach 1,168 by 2043. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesFM

CrossesDry Run

Location095400605

RouteCounty Highway 0

CountyO'Brien County

StateIowa

Coordinates43.08449, -95.61244

Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

Component	Rating	Meaning
Channel and channel protection	7 Good	Some minor problems.
Culvert	7 Good	Some minor problems.

Last inspectionJune 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

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating31.4 US tons

Inventory rating24.3 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans2

Design loadHS 20

Structure length29 ft (8.8 m)

Longest span14 ft (4.3 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,168 (2022)

Projected traffic1,168 by 2043

Trucks11%

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 proposedOther structural work, including hydraulic replacements

Estimated improvement cost$25,000 (2023 estimate)

NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Dry Run built?

It was built in 1998, making it 27 years old in 2025.

What condition is FM over Dry Run in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does FM over Dry Run carry?

About 1,168 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is FM over Dry Run?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m).

Who owns FM over Dry Run?

It is owned by the County Highway Agency.