US Bridges

Local RD over Tarkio Creek

PoorPosted for load

Montgomery County, Iowa · 071372005 · Structure no. 000000000254490

Built
1966
59 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
124 ft
1 main span
Daily traffic
11
2021 count
Owner
County
County Highway Agency

About this bridge

Local RD over Tarkio Creek is a steel stringer/multi-beam or girder carrying Local RD over Tarkio Creek in Montgomery County, Iowa. It was built in 1966, so it is 59 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 3 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 other load-capacity restriction.

It carries about 11 vehicles a day, projected to reach 11 by 2044. The structure is 124 ft (37.8 m) long and 16 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesLocal RD
CrossesTarkio Creek
Location071372005
RouteCounty Highway 0
StateIowa
Coordinates40.93352, -95.12242
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.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating41.3 US tons
Inventory rating33.7 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadUnknown
Structure length124 ft (37.8 m)
Longest span79 ft (24.1 m)
Deck width16 ft (5 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2021)
Projected traffic11 by 2044
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Local RD over Tarkio Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Local RD over Tarkio Creek 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 May 2024.

How much traffic does Local RD over Tarkio Creek carry?

About 11 vehicles per day (2021 count).

How long is Local RD over Tarkio Creek?

The structure is 124 ft (37.8 m) long with a longest span of 79 ft (24.1 m) and a deck 16 ft wide.

Who owns Local RD over Tarkio Creek?

It is owned by the County Highway Agency.