US Bridges

Main ST over Drainage

Good

Woodbury County, Iowa · 087433207 · Structure no. 000000000000380

Built
1970
55 years old
Condition
Good
inspected June 2023
Type
Culvert
Concrete Continuous
Length
24 ft
2 main spans
Daily traffic
1,167
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main ST over Drainage is a concrete continuous culvert carrying Main ST over Drainage in Woodbury County, Iowa. It was built in 1970, so it is 55 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 1,167 vehicles a day, roughly 14% of them trucks, projected to reach 1,167 by 2043. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMain ST
CrossesDrainage
Location087433207
RouteCity Street 0
StateIowa
Coordinates42.38826, -95.86903
Functional classRural Minor Collector

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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating53.6 US tons
Inventory rating32.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length24 ft (7.3 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 traffic1,167 (2022)
Projected traffic1,167 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST over Drainage built?

It was built in 1970, making it 55 years old in 2025.

What condition is Main ST over Drainage 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 June 2023.

How much traffic does Main ST over Drainage carry?

About 1,167 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is Main ST over Drainage?

The structure is 24 ft (7.3 m) long with a longest span of 12 ft (3.7 m).

Who owns Main ST over Drainage?

It is owned by the City or Municipal Highway Agency.