US Bridges

X-28 over Roberts Creek

FairPosted for load

Clayton County, Iowa · 070500525 · Structure no. 000000000010200

Built
1941
84 years old
Condition
Fair
inspected October 2022
Type
Truss - Thru
Steel
Length
90 ft
1 main span
Daily traffic
350
2022 count
Owner
County
County Highway Agency

About this bridge

X-28 over Roberts Creek is a steel truss - thru carrying X-28 over Roberts Creek in Clayton County, Iowa. It was built in 1941, so it is 84 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 other load-capacity restriction.

It carries about 350 vehicles a day, roughly 12% of them trucks, projected to reach 350 by 2043. The structure is 90 ft (27.4 m) long and 21 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesX-28
CrossesRoberts Creek
Location070500525
RouteCity Street 0
CountyClayton County
StateIowa
Coordinates42.93039, -91.38553
Functional classRural Major Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2022
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating33.5 US tons
Inventory rating20.3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length90 ft (27.4 m)
Longest span90 ft (27.4 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2022)
Projected traffic350 by 2043
Trucks12%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 X-28 over Roberts Creek built?

It was built in 1941, making it 84 years old in 2025.

What condition is X-28 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 October 2022.

How much traffic does X-28 over Roberts Creek carry?

About 350 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is X-28 over Roberts Creek?

The structure is 90 ft (27.4 m) long with a longest span of 90 ft (27.4 m) and a deck 21 ft wide.

Who owns X-28 over Roberts Creek?

It is owned by the County Highway Agency.