US Bridges

Concord Ave over Roberts Creek

FairPosted for load

Clayton County, Iowa · 095062604 · Structure no. 000000000121450

Built
1958
67 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
1 main span
Daily traffic
30
2022 count
Owner
County
County Highway Agency

About this bridge

Concord Ave over Roberts Creek is a steel stringer/multi-beam or girder carrying Concord Ave over Roberts Creek in Clayton County, Iowa. It was built in 1958, so it is 67 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 6 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 30 vehicles a day, projected to reach 30 by 2044. The structure is 81 ft (24.7 m) long and 22 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesConcord Ave
CrossesRoberts Creek
Location095062604
RouteCounty Highway 0
CountyClayton County
StateIowa
Coordinates43.02066, -91.51886
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: 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 rating37.8 US tons
Inventory rating29.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length81 ft (24.7 m)
Longest span80 ft (24.4 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2022)
Projected traffic30 by 2044
Trucks0%
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 Concord Ave over Roberts Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is Concord Ave over Roberts 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 September 2024.

How much traffic does Concord Ave over Roberts Creek carry?

About 30 vehicles per day (2022 count).

How long is Concord Ave over Roberts Creek?

The structure is 81 ft (24.7 m) long with a longest span of 80 ft (24.4 m) and a deck 22 ft wide.

Who owns Concord Ave over Roberts Creek?

It is owned by the County Highway Agency.