US Bridges

US 59 over Drainage Ditch

Fair

Pottawattamie County, Iowa · 2.4 Mi. N of N Jct. US 6 · Structure no. 000000000043360

Built
1930
95 years old, rebuilt 1951
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
79 ft
3 main spans
Daily traffic
1,810
2023 count
Owner
State
State Highway Agency

About this bridge

US 59 over Drainage Ditch is a concrete continuous slab carrying US 59 over Drainage Ditch in Pottawattamie County, Iowa. It was built in 1930 and reconstructed in 1951, so it is 95 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 1,810 vehicles a day, roughly 23% of them trucks, projected to reach 1,810 by 2043. The structure is 79 ft (24.1 m) long and 35 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesUS 59
CrossesDrainage Ditch
Location2.4 Mi. N of N Jct. US 6
RouteU.S. Route 59
StateIowa
Coordinates41.35179, -95.38412
Functional classRural Principal Arterial - Other

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.
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating56.2 US tons
Inventory rating33.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length79 ft (24.1 m)
Longest span26 ft (7.9 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,810 (2023)
Projected traffic1,810 by 2043
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 US 59 over Drainage Ditch built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1951.

What condition is US 59 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 November 2023.

How much traffic does US 59 over Drainage Ditch carry?

About 1,810 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is US 59 over Drainage Ditch?

The structure is 79 ft (24.1 m) long with a longest span of 26 ft (7.9 m) and a deck 35 ft wide.

Who owns US 59 over Drainage Ditch?

It is owned by the State Highway Agency.