US Bridges

150th Street over West Tarkio River

PoorPosted for load

Page County, Iowa · 070383401 · Structure no. 000000000268390

Built
1964
61 years old
Condition
Poor
inspected November 2022
Type
Truss - Thru
Steel
Length
93 ft
1 main span
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

150th Street over West Tarkio River is a steel truss - thru carrying 150th Street over West Tarkio River in Page County, Iowa. It was built in 1964, so it is 61 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 15 vehicles a day, projected to reach 15 by 2042. The structure is 93 ft (28.3 m) long and 19 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries150th Street
CrossesWest Tarkio River
Location070383401
RouteCounty Highway 0
StateIowa
Coordinates40.82873, -95.2051
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2022
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating18.6 US tons
Inventory rating13.2 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length93 ft (28.3 m)
Longest span90 ft (27.4 m)
Deck width19 ft (5.8 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)
Projected traffic15 by 2042
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 150th Street over West Tarkio River built?

It was built in 1964, making it 61 years old in 2025.

What condition is 150th Street over West Tarkio River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2022.

How much traffic does 150th Street over West Tarkio River carry?

About 15 vehicles per day (2022 count).

How long is 150th Street over West Tarkio River?

The structure is 93 ft (28.3 m) long with a longest span of 90 ft (27.4 m) and a deck 19 ft wide.

Who owns 150th Street over West Tarkio River?

It is owned by the County Highway Agency.