US Bridges

Echo Ave over Rock Creek

FairPosted for load

Mitchell County, Iowa · 098182204 · Structure no. 000000000248160

Built
1920
105 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
44
2022 count
Owner
County
County Highway Agency

About this bridge

Echo Ave over Rock Creek is a steel stringer/multi-beam or girder carrying Echo Ave over Rock Creek in Mitchell County, Iowa. It was built in 1920, so it is 105 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 2043. The structure is 31 ft (9.4 m) long and 18 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesEcho Ave
CrossesRock Creek
Location098182204
RouteCounty Highway 0
CountyMitchell County
StateIowa
Coordinates43.29472, -92.94513
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating33 US tons
Inventory rating19 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span31 ft (9.4 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44 (2022)
Projected traffic44 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Echo Ave over Rock Creek built?

It was built in 1920, making it 105 years old in 2025.

What condition is Echo Ave 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 December 2023.

How much traffic does Echo Ave over Rock Creek carry?

About 44 vehicles per day (2022 count).

How long is Echo Ave over Rock Creek?

The structure is 31 ft (9.4 m) long with a longest span of 31 ft (9.4 m) and a deck 18 ft wide.

Who owns Echo Ave over Rock Creek?

It is owned by the County Highway Agency.