M38 Rocky Run over Rocky Run

Good

Crawford County, Iowa · 084382804 · Structure no. 000000000128911

Built: 2005; 20 years old
Condition: Good; inspected April 2024
Type: Culvert; Concrete Continuous
Length: 33 ft; 2 main spans
Daily traffic: 71; 2022 count
Owner: County; County Highway Agency

About this bridge

M38 Rocky Run over Rocky Run is a concrete continuous culvert carrying M38 Rocky Run over Rocky Run in Crawford County, Iowa. It was built in 2005, so it is 20 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 71 vehicles a day, projected to reach 71 by 2044. The structure is 33 ft (10.1 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesM38 Rocky Run

CrossesRocky Run

Location084382804

RouteCounty Highway 0

CountyCrawford County

StateIowa

Coordinates42.06235, -95.2753

Functional classRural Minor 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 inspectionApril 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation7: Better than present minimum criteria

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating48.6 US tons

Inventory rating36 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans2

Design loadHS 20

Structure length33 ft (10.1 m)

Longest span12 ft (3.7 m)

Deck width26 ft (7.9 m)

Roadway width26 ft (7.9 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2022)

Projected traffic71 by 2044

Trucks0%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed5 mi (8 km)

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency

Maintained byCounty Highway Agency

Historic statusPossibly eligible for the National Register; requires further investigation

Work proposedOther structural work, including hydraulic replacements

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was M38 Rocky Run over Rocky Run built?

It was built in 2005, making it 20 years old in 2025.

What condition is M38 Rocky Run over Rocky 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 April 2024.

How much traffic does M38 Rocky Run over Rocky Run carry?

About 71 vehicles per day (2022 count).

How long is M38 Rocky Run over Rocky Run?

The structure is 33 ft (10.1 m) long with a longest span of 12 ft (3.7 m) and a deck 26 ft wide.

Who owns M38 Rocky Run over Rocky Run?

It is owned by the County Highway Agency.