US Bridges

205th ST over Blackhawk Creek

Fair

Grundy County, Iowa · 088172703 · Structure no. 000000000165151

Built
1993
32 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
56 ft
3 main spans
Daily traffic
452
2022 count
Owner
County
County Highway Agency

About this bridge

205th ST over Blackhawk Creek is a concrete continuous culvert carrying 205th ST over Blackhawk Creek in Grundy County, Iowa. It was built in 1993, so it is 32 years old, younger 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 452 vehicles a day, roughly 21% of them trucks, projected to reach 452 by 2044. The structure is 56 ft (17.1 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Carries205th ST
CrossesBlackhawk Creek
Location088172703
RouteCounty Highway 0
StateIowa
Coordinates42.40539, -92.82671
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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
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 alignment6: Equal to present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span17 ft (5.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic452 (2022)
Projected traffic452 by 2044
Trucks21%
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 205th ST over Blackhawk Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is 205th ST over Blackhawk Creek 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 205th ST over Blackhawk Creek carry?

About 452 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is 205th ST over Blackhawk Creek?

The structure is 56 ft (17.1 m) long with a longest span of 17 ft (5.2 m).

Who owns 205th ST over Blackhawk Creek?

It is owned by the County Highway Agency.