US Bridges

Birch RD over Stream

Fair

Clayton County, Iowa · 093062908 · Structure no. 000000000120110

Built
1946
79 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

Birch RD over Stream is a concrete culvert carrying Birch RD over Stream in Clayton County, Iowa. It was built in 1946, so it is 79 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.

It carries about 15 vehicles a day, projected to reach 15 by 2044. The structure is 27 ft (8.2 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesBirch RD
CrossesStream
Location093062908
RouteCounty Highway 0
CountyClayton County
StateIowa
Coordinates42.84736, -91.57224
Functional classRural Minor 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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.6 US tons
Inventory rating18.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width32 ft (9.7 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)
Projected traffic15 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Birch RD over Stream built?

It was built in 1946, making it 79 years old in 2025.

What condition is Birch RD over 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 Birch RD over Stream carry?

About 15 vehicles per day (2022 count).

How long is Birch RD over Stream?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m) and a deck 32 ft wide.

Who owns Birch RD over Stream?

It is owned by the County Highway Agency.