US Bridges

Mill Cr. Expwy. over Mill Creek

Fair

Clinton County, Iowa · 081061107 · Structure no. 000000000504540

Built
2000
25 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
263 ft
3 main spans
Daily traffic
7,619
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mill Cr. Expwy. over Mill Creek is a prestressed concrete stringer/multi-beam or girder carrying Mill Cr. Expwy. over Mill Creek in Clinton County, Iowa. It was built in 2000, so it is 25 years old, younger 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.

It carries about 7,619 vehicles a day, roughly 4% of them trucks, projected to reach 7,619 by 2044. The structure is 263 ft (80.2 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesMill Cr. Expwy.
CrossesMill Creek
Location081061107
RouteCity Street 0
CountyClinton County
StateIowa
Coordinates41.84266, -90.23737
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length263 ft (80.2 m)
Longest span92 ft (28 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,619 (2022)
Projected traffic7,619 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mill Cr. Expwy. over Mill Creek built?

It was built in 2000, making it 25 years old in 2025.

What condition is Mill Cr. Expwy. over Mill 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 May 2024.

How much traffic does Mill Cr. Expwy. over Mill Creek carry?

About 7,619 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Mill Cr. Expwy. over Mill Creek?

The structure is 263 ft (80.2 m) long with a longest span of 92 ft (28 m) and a deck 43 ft wide.

Who owns Mill Cr. Expwy. over Mill Creek?

It is owned by the City or Municipal Highway Agency.