US Bridges

E66 over Drainage Ditch

Fair

Tama County, Iowa · 083143603 · Structure no. 000000000049731

Built
1976
49 years old
Condition
Fair
inspected September 2022
Type
Culvert
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
1,051
2023 count
Owner
County
County Highway Agency

About this bridge

E66 over Drainage Ditch is a concrete continuous culvert carrying E66 over Drainage Ditch in Tama County, Iowa. It was built in 1976, so it is 49 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 1,051 vehicles a day, projected to reach 1,051 by 2043. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesE66
CrossesDrainage Ditch
Location083143603
RouteCounty Highway 0
CountyTama County
StateIowa
Coordinates41.95859, -92.4281
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,051 (2023)
Projected traffic1,051 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was E66 over Drainage Ditch built?

It was built in 1976, making it 49 years old in 2025.

What condition is E66 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 September 2022.

How much traffic does E66 over Drainage Ditch carry?

About 1,051 vehicles per day (2023 count).

How long is E66 over Drainage Ditch?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m).

Who owns E66 over Drainage Ditch?

It is owned by the County Highway Agency.