US Bridges

325th over Rock Creek

FairPosted for load

Mitchell County, Iowa · 097170703 · Structure no. 000000000247520

Built
1956
69 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
2 main spans
Daily traffic
44
2022 count
Owner
County
County Highway Agency

About this bridge

325th over Rock Creek is a steel stringer/multi-beam or girder carrying 325th over Rock Creek in Mitchell County, Iowa. It was built in 1956, so it is 69 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 44 vehicles a day, projected to reach 44 by 2044. The structure is 80 ft (24.4 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries325th
CrossesRock Creek
Location097170703
RouteCounty Highway 0
CountyMitchell County
StateIowa
Coordinates43.23453, -92.9022
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating39 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans2
Design loadUnknown
Structure length80 ft (24.4 m)
Longest span40 ft (12.2 m)
Deck width24 ft (7.2 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44 (2022)
Projected traffic44 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 325th over Rock Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is 325th over Rock Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does 325th over Rock Creek carry?

About 44 vehicles per day (2022 count).

How long is 325th over Rock Creek?

The structure is 80 ft (24.4 m) long with a longest span of 40 ft (12.2 m) and a deck 24 ft wide.

Who owns 325th over Rock Creek?

It is owned by the County Highway Agency.