US Bridges

Local RD over Branch Tarkio Creek

PoorPosted for load

Montgomery County, Iowa · 073372604 · Structure no. 000000000256380

Built
1959
66 years old
Condition
Poor
inspected May 2023
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
15
2021 count
Owner
County
County Highway Agency

About this bridge

Local RD over Branch Tarkio Creek is a concrete channel beam carrying Local RD over Branch Tarkio Creek in Montgomery County, Iowa. It was built in 1959, so it is 66 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 2043. The structure is 31 ft (9.4 m) long and 21 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLocal RD
CrossesBranch Tarkio Creek
Location073372604
RouteCounty Highway 0
CountyMontgomery County
StateIowa
Coordinates41.10121, -95.07043
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating24 US tons
Inventory rating17.5 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadH 15
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width21 ft (6.3 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2021)
Projected traffic15 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-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$412,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Local RD over Branch Tarkio Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Local RD over Branch 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 2023.

How much traffic does Local RD over Branch Tarkio Creek carry?

About 15 vehicles per day (2021 count).

How long is Local RD over Branch Tarkio Creek?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 21 ft wide.

Who owns Local RD over Branch Tarkio Creek?

It is owned by the County Highway Agency.