US Bridges

B55 170th ST over E Fork Des Moines River

Good

Kossuth County, Iowa · 095283101 · Structure no. 000000000214611

Built
2022
3 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
246 ft
3 main spans
Daily traffic
350
2022 count
Owner
County
County Highway Agency

About this bridge

B55 170th ST over E Fork Des Moines River is a prestressed concrete stringer/multi-beam or girder carrying B55 170th ST over E Fork Des Moines River in Kossuth County, Iowa. It was built in 2022, so it is 3 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 350 vehicles a day, roughly 25% of them trucks, projected to reach 350 by 2043. The structure is 246 ft (75 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesB55 170th ST
CrossesE Fork Des Moines River
Location095283101
RouteCounty Highway 0
StateIowa
Coordinates43.00928, -94.20465
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating73.5 US tons
Inventory rating50.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length246 ft (75 m)
Longest span81 ft (24.8 m)
Deck width33 ft (10.2 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2022)
Projected traffic350 by 2043
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 B55 170th ST over E Fork Des Moines River built?

It was built in 2022, making it 3 years old in 2025.

What condition is B55 170th ST over E Fork Des Moines 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 May 2023.

How much traffic does B55 170th ST over E Fork Des Moines River carry?

About 350 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is B55 170th ST over E Fork Des Moines River?

The structure is 246 ft (75 m) long with a longest span of 81 ft (24.8 m) and a deck 33 ft wide.

Who owns B55 170th ST over E Fork Des Moines River?

It is owned by the County Highway Agency.