US Bridges

I-35 over Drainage Ditch NO.48

Good

Franklin County, Iowa · 0.3 MI S of SR C47 · Structure no. 000000000602445

Built
1974
51 years old
Condition
Good
inspected November 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
15,100
2022 count
Owner
State
State Highway Agency

About this bridge

I-35 over Drainage Ditch NO.48 is a concrete continuous culvert carrying I-35 over Drainage Ditch NO.48 in Franklin 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15,100 vehicles a day, roughly 31% of them trucks, projected to reach 15,100 by 2044. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-35
CrossesDrainage Ditch NO.48
Location0.3 MI S of SR C47
RouteInterstate 35
CountyFranklin County
StateIowa
Coordinates42.66978, -93.45822
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2024
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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating25.4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,100 (2022)
Projected traffic15,100 by 2044
Trucks31%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-35 over Drainage Ditch NO.48 built?

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

What condition is I-35 over Drainage Ditch NO.48 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does I-35 over Drainage Ditch NO.48 carry?

About 15,100 vehicles per day (2022 count), of which roughly 31% are trucks.

How long is I-35 over Drainage Ditch NO.48?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m).

Who owns I-35 over Drainage Ditch NO.48?

It is owned by the State Highway Agency.