US Bridges

US 169 over W Fork Des Moines River

Fair

Humboldt County, Iowa · 0.6 MI S of Ia 3 · Structure no. 000000000028871

Built
1997
28 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
336 ft
3 main spans
Daily traffic
7,100
2022 count
Owner
State
State Highway Agency

About this bridge

US 169 over W Fork Des Moines River is a prestressed concrete stringer/multi-beam or girder carrying US 169 over W Fork Des Moines River in Humboldt County, Iowa. It was built in 1997, so it is 28 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 7,100 vehicles a day, roughly 12% of them trucks, projected to reach 7,100 by 2043. The structure is 336 ft (102.4 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 169
CrossesW Fork Des Moines River
Location0.6 MI S of Ia 3
RouteU.S. Route 169
StateIowa
Coordinates42.72169, -94.22688
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.8 US tons
Inventory rating32 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length336 ft (102.4 m)
Longest span112 ft (34.1 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,100 (2022)
Projected traffic7,100 by 2043
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 169 over W Fork Des Moines River built?

It was built in 1997, making it 28 years old in 2025.

What condition is US 169 over W Fork Des Moines River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does US 169 over W Fork Des Moines River carry?

About 7,100 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is US 169 over W Fork Des Moines River?

The structure is 336 ft (102.4 m) long with a longest span of 112 ft (34.1 m) and a deck 59 ft wide.

Who owns US 169 over W Fork Des Moines River?

It is owned by the State Highway Agency.