US Bridges

Granite Ave over Dry Hollow

FairPosted for load

Clayton County, Iowa · 094041904 · Structure no. 000000000120351

Built
1950
75 years old, rebuilt 1973
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
47 ft
1 main span
Daily traffic
35
2022 count
Owner
County
County Highway Agency

About this bridge

Granite Ave over Dry Hollow is a steel stringer/multi-beam or girder carrying Granite Ave over Dry Hollow in Clayton County, Iowa. It was built in 1950 and reconstructed in 1973, so it is 75 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 35 vehicles a day, projected to reach 35 by 2044. The structure is 47 ft (14.3 m) long and 19 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesGranite Ave
CrossesDry Hollow
Location094041904
RouteCounty Highway 0
CountyClayton County
StateIowa
Coordinates42.94519, -91.34967
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating35.4 US tons
Inventory rating27.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length47 ft (14.3 m)
Longest span47 ft (14.3 m)
Deck width19 ft (5.7 m)
Roadway width19 ft (5.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2022)
Projected traffic35 by 2044
Trucks0%
Lanes on structure2
Traffic directionOne-lane bridge for two-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Granite Ave over Dry Hollow built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1973.

What condition is Granite Ave over Dry Hollow 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 Granite Ave over Dry Hollow carry?

About 35 vehicles per day (2022 count).

How long is Granite Ave over Dry Hollow?

The structure is 47 ft (14.3 m) long with a longest span of 47 ft (14.3 m) and a deck 19 ft wide.

Who owns Granite Ave over Dry Hollow?

It is owned by the County Highway Agency.