US Bridges

Ia 136 over Drainage Ditch

Fair

Clinton County, Iowa · 8.6 Mi. N of Jct. US 61 · Structure no. 000000000021160

Built
1952
73 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
29 ft
1 main span
Daily traffic
1,230
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 136 over Drainage Ditch is a steel stringer/multi-beam or girder carrying Ia 136 over Drainage Ditch in Clinton County, Iowa. It was built in 1952, so it is 73 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.

It carries about 1,230 vehicles a day, roughly 13% of them trucks, projected to reach 1,230 by 2044. The structure is 29 ft (8.8 m) long and 35 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesIa 136
CrossesDrainage Ditch
Location8.6 Mi. N of Jct. US 61
RouteState Highway 136
CountyClinton County
StateIowa
Coordinates41.97048, -90.80944
Functional classRural Minor 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.
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating38.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length29 ft (8.8 m)
Longest span29 ft (8.8 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,230 (2022)
Projected traffic1,230 by 2044
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

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 Drainage Ditch built?

It was built in 1952, making it 73 years old in 2025.

What condition is Ia 136 over Drainage Ditch 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 2024.

How much traffic does Ia 136 over Drainage Ditch carry?

About 1,230 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Ia 136 over Drainage Ditch?

The structure is 29 ft (8.8 m) long with a longest span of 29 ft (8.8 m) and a deck 35 ft wide.

Who owns Ia 136 over Drainage Ditch?

It is owned by the State Highway Agency.