US Bridges

G63 305th ST over Drainage

Good

Mahaska County, Iowa · 074151303 · Structure no. 000000000235481

Built
2016
9 years old
Condition
Good
inspected December 2022
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
120
2022 count
Owner
County
County Highway Agency

About this bridge

G63 305th ST over Drainage is a concrete continuous culvert carrying G63 305th ST over Drainage in Mahaska County, Iowa. It was built in 2016, so it is 9 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 120 vehicles a day, projected to reach 120 by 2043. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesG63 305th ST
CrossesDrainage
Location074151303
RouteCounty Highway 0
CountyMahaska County
StateIowa
Coordinates41.21218, -92.5403
Functional classRural Major 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.
Culvert8 Very GoodNo problems noted.
Last inspectionDecember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating47.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHL 93
Structure length26 ft (7.9 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2022)
Projected traffic120 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 G63 305th ST over Drainage built?

It was built in 2016, making it 9 years old in 2025.

What condition is G63 305th 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 December 2022.

How much traffic does G63 305th ST over Drainage carry?

About 120 vehicles per day (2022 count).

How long is G63 305th ST over Drainage?

The structure is 26 ft (7.9 m) long with a longest span of 13 ft (4 m).

Who owns G63 305th ST over Drainage?

It is owned by the County Highway Agency.