US Bridges

Ia 136 over Mississippi River & RR

Fair

Clinton County, Iowa · In North Clinton · Structure no. 000000000021055

Built
1974
51 years old
Condition
Fair
inspected September 2023
Type
Truss - Thru
Steel
Length
3,012 ft
3 main spans
Daily traffic
11,000
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 136 over Mississippi River & RR is a steel truss - thru carrying Ia 136 over Mississippi River & RR in Clinton County, Iowa. It was built in 1974, so it is 51 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 11,000 vehicles a day, roughly 6% of them trucks, projected to reach 11,000 by 2043. The structure is 3,012 ft (918.1 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesIa 136
CrossesMississippi River & RR
LocationIn North Clinton
RouteState Highway 136
CountyClinton County
StateIowa
Coordinates41.86488, -90.17349
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.7 US tons
Inventory rating46.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+22 approach)
Design loadHS 20
Structure length3,012 ft (918.1 m)
Longest span500 ft (152.4 m)
Deck width33 ft (10.1 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic11,000 (2022)
Projected traffic11,000 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad and waterway
Detour if closed6.2 mi (10 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Ia 136 over Mississippi River & RR built?

It was built in 1974, making it 51 years old in 2025.

What condition is Ia 136 over Mississippi River & RR 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 September 2023.

How much traffic does Ia 136 over Mississippi River & RR carry?

About 11,000 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Ia 136 over Mississippi River & RR?

The structure is 3,012 ft (918.1 m) long with a longest span of 500 ft (152.4 m) and a deck 33 ft wide.

Who owns Ia 136 over Mississippi River & RR?

It is owned by the State Highway Agency.