US Bridges

N Union RD over Beaver Creek

Fair

Black Hawk County, Iowa · 90-14-28-06-20 · Structure no. 000000000076841

Built
1954
71 years old, rebuilt 1980
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
254 ft
3 main spans
Daily traffic
1,394
2022 count
Owner
County
County Highway Agency

About this bridge

N Union RD over Beaver Creek is a steel continuous stringer/multi-beam or girder carrying N Union RD over Beaver Creek in Black Hawk County, Iowa. It was built in 1954 and reconstructed in 1980, so it is 71 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 1,394 vehicles a day, roughly 9% of them trucks, projected to reach 1,394 by 2044. The structure is 254 ft (77.4 m) long and 35 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesN Union RD
CrossesBeaver Creek
Location90-14-28-06-20
RouteCounty Highway 0
CountyBlack Hawk County
StateIowa
Coordinates42.57313, -92.50684
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58.2 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length254 ft (77.4 m)
Longest span98 ft (29.9 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 built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1980.

What condition is N Union RD over Beaver 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 November 2024.

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

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

How long is N Union RD over Beaver Creek?

The structure is 254 ft (77.4 m) long with a longest span of 98 ft (29.9 m) and a deck 35 ft wide.

Who owns N Union RD over Beaver Creek?

It is owned by the County Highway Agency.