US Bridges

Boyson RD over Dry Creek

Fair

Linn County, Iowa · 000000000 · Structure no. 000000000501130

Built
2000
25 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete Continuous
Length
112 ft
3 main spans
Daily traffic
14,100
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Boyson RD over Dry Creek is a concrete continuous slab carrying Boyson RD over Dry Creek in Linn County, Iowa. It was built in 2000, so it is 25 years old, younger 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 14,100 vehicles a day, projected to reach 14,100 by 2043. The structure is 112 ft (34.1 m) long and 72 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesBoyson RD
CrossesDry Creek
Location000000000
RouteCity Street 0
CountyLinn County
StateIowa
Coordinates42.04778, -91.66679
Functional classUrban Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating53.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length112 ft (34.1 m)
Longest span44 ft (13.4 m)
Deck width72 ft (21.9 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,100 (2021)
Projected traffic14,100 by 2043
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Boyson RD over Dry Creek built?

It was built in 2000, making it 25 years old in 2025.

What condition is Boyson RD over Dry 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 April 2023.

How much traffic does Boyson RD over Dry Creek carry?

About 14,100 vehicles per day (2021 count).

How long is Boyson RD over Dry Creek?

The structure is 112 ft (34.1 m) long with a longest span of 44 ft (13.4 m) and a deck 72 ft wide.

Who owns Boyson RD over Dry Creek?

It is owned by the City or Municipal Highway Agency.