US Bridges

Harmon RD over Spring Creek

FairPosted for load

Black Hawk County, Iowa · 87-11-27-01-10 · Structure no. 000000000073890

Built
1948
77 years old, rebuilt 2009
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
162 ft
5 main spans
Daily traffic
39
2022 count
Owner
County
County Highway Agency

About this bridge

Harmon RD over Spring Creek is a steel stringer/multi-beam or girder carrying Harmon RD over Spring Creek in Black Hawk County, Iowa. It was built in 1948 and reconstructed in 2009, so it is 77 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. Its operating status is: posted for load restriction.

It carries about 39 vehicles a day, projected to reach 39 by 2044. The structure is 162 ft (49.4 m) long and 19 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesHarmon RD
CrossesSpring Creek
Location87-11-27-01-10
RouteCounty Highway 0
CountyBlack Hawk County
StateIowa
Coordinates42.32622, -92.11417
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating33.7 US tons
Inventory rating20.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length162 ft (49.4 m)
Longest span32 ft (9.8 m)
Deck width19 ft (5.9 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic39 (2022)
Projected traffic39 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Harmon RD over Spring Creek built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 2009.

What condition is Harmon RD over Spring 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 October 2024.

How much traffic does Harmon RD over Spring Creek carry?

About 39 vehicles per day (2022 count).

How long is Harmon RD over Spring Creek?

The structure is 162 ft (49.4 m) long with a longest span of 32 ft (9.8 m) and a deck 19 ft wide.

Who owns Harmon RD over Spring Creek?

It is owned by the County Highway Agency.