US Bridges

Agate RD over Small Stream

Fair

Clayton County, Iowa · 094062103 · Structure no. 000000000120791

Built
1978
47 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
28 ft
2 main spans
Daily traffic
295
2022 count
Owner
County
County Highway Agency

About this bridge

Agate RD over Small Stream is a concrete culvert carrying Agate RD over Small Stream in Clayton County, Iowa. It was built in 1978, so it is 47 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 295 vehicles a day, roughly 20% of them trucks, projected to reach 295 by 2044. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesAgate RD
CrossesSmall Stream
Location094062103
RouteCounty Highway 0
CountyClayton County
StateIowa
Coordinates42.94637, -91.56293
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34 US tons
Inventory rating25 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length28 ft (8.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic295 (2022)
Projected traffic295 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Agate RD over Small Stream built?

It was built in 1978, making it 47 years old in 2025.

What condition is Agate RD over Small Stream 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 Agate RD over Small Stream carry?

About 295 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is Agate RD over Small Stream?

The structure is 28 ft (8.5 m) long with a longest span of 12 ft (3.7 m).

Who owns Agate RD over Small Stream?

It is owned by the County Highway Agency.