US Bridges

FM over Blackhawk Creek Branch

Fair

Grundy County, Iowa · 088163303 · Structure no. 000000000164960

Built
1964
61 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
550
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Blackhawk Creek Branch is a concrete continuous culvert carrying FM over Blackhawk Creek Branch in Grundy 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 fair condition with a lowest component rating of 5 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 550 vehicles a day, roughly 19% of them trucks, projected to reach 550 by 2044. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesFM
CrossesBlackhawk Creek Branch
Location088163303
RouteCounty Highway 0
CountyGrundy County
StateIowa
Coordinates42.39131, -92.71381
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.8 US tons
Inventory rating44.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2022)
Projected traffic550 by 2044
Trucks19%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Blackhawk Creek Branch built?

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

What condition is FM over Blackhawk Creek Branch 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 2024.

How much traffic does FM over Blackhawk Creek Branch carry?

About 550 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is FM over Blackhawk Creek Branch?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns FM over Blackhawk Creek Branch?

It is owned by the County Highway Agency.