US Bridges

Old Mill RD over Catfish Creek

Fair

Dubuque County, Iowa · N.W. of Rockdale RD · Structure no. 000000000146421

Built
1978
47 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
155 ft
3 main spans
Daily traffic
5,395
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Old Mill RD over Catfish Creek is a prestressed concrete stringer/multi-beam or girder carrying Old Mill RD over Catfish Creek in Dubuque County, Iowa. It was built in 1978, so it is 47 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.

It carries about 5,395 vehicles a day, projected to reach 5,395 by 2043. The structure is 155 ft (47.2 m) long and 39 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesOld Mill RD
CrossesCatfish Creek
LocationN.W. of Rockdale RD
RouteCity Street 0
CountyDubuque County
StateIowa
Coordinates42.46736, -90.67826
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.9 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length155 ft (47.2 m)
Longest span56 ft (17.1 m)
Deck width39 ft (11.9 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,395 (2022)
Projected traffic5,395 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Old Mill RD over Catfish Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Old Mill RD over Catfish 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 August 2023.

How much traffic does Old Mill RD over Catfish Creek carry?

About 5,395 vehicles per day (2022 count).

How long is Old Mill RD over Catfish Creek?

The structure is 155 ft (47.2 m) long with a longest span of 56 ft (17.1 m) and a deck 39 ft wide.

Who owns Old Mill RD over Catfish Creek?

It is owned by the City or Municipal Highway Agency.