US Bridges

FM over Drainage Ditch #2

Poor

Mahaska County, Iowa · 074160403 · Structure no. 000000000235610

Built
1951
74 years old
Condition
Poor
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
32 ft
1 main span
Daily traffic
40
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Drainage Ditch #2 is a steel stringer/multi-beam or girder carrying FM over Drainage Ditch #2 in Mahaska County, Iowa. It was built in 1951, so it is 74 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.

It carries about 40 vehicles a day, projected to reach 40 by 2044. The structure is 32 ft (9.8 m) long and 22 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM
CrossesDrainage Ditch #2
Location074160403
RouteCounty Highway 0
CountyMahaska County
StateIowa
Coordinates41.24112, -92.70647
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating28.8 US tons
Inventory rating17.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2022)
Projected traffic40 by 2044
Trucks0%
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 FM over Drainage Ditch #2 built?

It was built in 1951, making it 74 years old in 2025.

What condition is FM over Drainage Ditch #2 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 December 2024.

How much traffic does FM over Drainage Ditch #2 carry?

About 40 vehicles per day (2022 count).

How long is FM over Drainage Ditch #2?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 22 ft wide.

Who owns FM over Drainage Ditch #2?

It is owned by the County Highway Agency.