US Bridges

N Union RD over Beaver Creek Overflow

Fair

Black Hawk County, Iowa · 90-14-28-06 · Structure no. 000000000076831

Built
1980
45 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
177 ft
4 main spans
Daily traffic
1,394
2022 count
Owner
County
County Highway Agency

About this bridge

N Union RD over Beaver Creek Overflow is a concrete continuous slab carrying N Union RD over Beaver Creek Overflow in Black Hawk County, Iowa. It was built in 1980, so it is 45 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 1,394 vehicles a day, roughly 9% of them trucks, projected to reach 1,394 by 2044. The structure is 177 ft (54 m) long and 35 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesN Union RD
CrossesBeaver Creek Overflow
Location90-14-28-06
RouteCounty Highway 0
StateIowa
Coordinates42.57158, -92.50766
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating57.4 US tons
Inventory rating34.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length177 ft (54 m)
Longest span49 ft (14.9 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,394 (2022)
Projected traffic1,394 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 N Union RD over Beaver Creek Overflow built?

It was built in 1980, making it 45 years old in 2025.

What condition is N Union RD over Beaver Creek Overflow 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 November 2024.

How much traffic does N Union RD over Beaver Creek Overflow carry?

About 1,394 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is N Union RD over Beaver Creek Overflow?

The structure is 177 ft (54 m) long with a longest span of 49 ft (14.9 m) and a deck 35 ft wide.

Who owns N Union RD over Beaver Creek Overflow?

It is owned by the County Highway Agency.