US Bridges

Ia 136 over Mill Creek

Fair

Clinton County, Iowa · 2.7 Mi. N of N Jct. US 67 · Structure no. 000000000021071

Built
1989
36 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
193 ft
2 main spans
Daily traffic
1,430
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 136 over Mill Creek is a prestressed concrete stringer/multi-beam or girder carrying Ia 136 over Mill Creek in Clinton County, Iowa. It was built in 1989, so it is 36 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 1,430 vehicles a day, roughly 5% of them trucks, projected to reach 1,430 by 2044. The structure is 193 ft (58.8 m) long and 39 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

Open in Google Maps
CarriesIa 136
CrossesMill Creek
Location2.7 Mi. N of N Jct. US 67
RouteState Highway 136
CountyClinton County
StateIowa
Coordinates41.87366, -90.23731
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99.8 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length193 ft (58.8 m)
Longest span96 ft (29.3 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,430 (2022)
Projected traffic1,430 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Ia 136 over Mill Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is Ia 136 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 Ia 136 over Mill Creek carry?

About 1,430 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Ia 136 over Mill Creek?

The structure is 193 ft (58.8 m) long with a longest span of 96 ft (29.3 m) and a deck 39 ft wide.

Who owns Ia 136 over Mill Creek?

It is owned by the State Highway Agency.