US Bridges

So Main ST RD over S Dry Run

Poor

Black Hawk County, Iowa · 000000000 · Structure no. 000000000001170

Built
1968
57 years old
Condition
Poor
inspected March 2024
Type
Tee Beam
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
6,093
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

So Main ST RD over S Dry Run is a prestressed concrete tee beam carrying So Main ST RD over S Dry Run in Black Hawk County, Iowa. It was built in 1968, so it is 57 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 6,093 vehicles a day, projected to reach 6,093 by 2044. The structure is 42 ft (12.8 m) long and 61 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSo Main ST RD
CrossesS Dry Run
Location000000000
RouteCity Street 0
CountyBlack Hawk County
StateIowa
Coordinates42.50768, -92.44599
Functional classUrban Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58 US tons
Inventory rating34.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length42 ft (12.8 m)
Longest span40 ft (12.2 m)
Deck width61 ft (18.6 m)
Roadway width49 ft (14.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,093 (2022)
Projected traffic6,093 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 So Main ST RD over S Dry Run built?

It was built in 1968, making it 57 years old in 2025.

What condition is So Main ST RD over S Dry Run in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does So Main ST RD over S Dry Run carry?

About 6,093 vehicles per day (2022 count).

How long is So Main ST RD over S Dry Run?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 61 ft wide.

Who owns So Main ST RD over S Dry Run?

It is owned by the City or Municipal Highway Agency.