US Bridges

Mason Ave over Little Sioux River

Good

Woodbury County, Iowa · 088432107 · Structure no. 000000000353282

Built
2021
4 years old
Condition
Good
inspected July 2024
Type
Slab
Concrete Continuous
Length
210 ft
4 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

Mason Ave over Little Sioux River is a concrete continuous slab carrying Mason Ave over Little Sioux River in Woodbury County, Iowa. It was built in 2021, so it is 4 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 20 vehicles a day, projected to reach 20 by 2044. The structure is 210 ft (64 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesMason Ave
CrossesLittle Sioux River
Location088432107
RouteCounty Highway 0
StateIowa
Coordinates42.42705, -95.84542
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length210 ft (64 m)
Longest span59 ft (18 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mason Ave over Little Sioux River built?

It was built in 2021, making it 4 years old in 2025.

What condition is Mason Ave over Little Sioux River 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 July 2024.

How much traffic does Mason Ave over Little Sioux River carry?

About 20 vehicles per day (2022 count).

How long is Mason Ave over Little Sioux River?

The structure is 210 ft (64 m) long with a longest span of 59 ft (18 m) and a deck 27 ft wide.

Who owns Mason Ave over Little Sioux River?

It is owned by the County Highway Agency.