US Bridges

FM over Br Blackhawk Ck

Fair

Grundy County, Iowa · 088152002 · Structure no. 000000000164715

Built
1977
48 years old
Condition
Fair
inspected April 2022
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
1,051
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Br Blackhawk Ck is a concrete continuous culvert carrying FM over Br Blackhawk Ck in Grundy County, Iowa. It was built in 1977, so it is 48 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 6 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 1,051 vehicles a day, projected to reach 1,051 by 2043. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFM
CrossesBr Blackhawk Ck
Location088152002
RouteCounty Highway 0
CountyGrundy County
StateIowa
Coordinates42.41574, -92.63122
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,051 (2022)
Projected traffic1,051 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Br Blackhawk Ck built?

It was built in 1977, making it 48 years old in 2025.

What condition is FM over Br Blackhawk Ck 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 2022.

How much traffic does FM over Br Blackhawk Ck carry?

About 1,051 vehicles per day (2022 count).

How long is FM over Br Blackhawk Ck?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns FM over Br Blackhawk Ck?

It is owned by the County Highway Agency.