US Bridges

50th ST over Unnamed Waterway

Good

Franklin County, Iowa · 090201901 · Structure no. 000000000365775

Built
2011
14 years old
Condition
Good
inspected June 2021
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
49
2022 count
Owner
County
County Highway Agency

About this bridge

50th ST over Unnamed Waterway is a concrete continuous culvert carrying 50th ST over Unnamed Waterway in Franklin County, Iowa. It was built in 2011, so it is 14 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 49 vehicles a day, roughly 6% of them trucks, projected to reach 49 by 2043. The structure is 23 ft (7 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Carries50th ST
CrossesUnnamed Waterway
Location090201901
RouteCounty Highway 0
StateIowa
Coordinates42.60069, -93.2572
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 protection9 ExcellentNo problems noted.
Culvert9 ExcellentNo problems noted.
Last inspectionJune 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length23 ft (7 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49 (2022)
Projected traffic49 by 2043
Trucks6%
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 50th ST over Unnamed Waterway built?

It was built in 2011, making it 14 years old in 2025.

What condition is 50th ST over Unnamed Waterway 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 2021.

How much traffic does 50th ST over Unnamed Waterway carry?

About 49 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is 50th ST over Unnamed Waterway?

The structure is 23 ft (7 m) long with a longest span of 11 ft (3.4 m).

Who owns 50th ST over Unnamed Waterway?

It is owned by the County Highway Agency.