US Bridges

Kenyon RD NB over Dm River & B Ave

Fair

Webster County, Iowa · 1.3 MI N of S JCT US 169 · Structure no. 000000000052083

Built
1977
48 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
561 ft
5 main spans
Daily traffic
3,109
2022 count
Owner
State
State Highway Agency

About this bridge

Kenyon RD NB over Dm River & B Ave is a steel continuous stringer/multi-beam or girder carrying Kenyon RD NB over Dm River & B Ave in Webster County, Iowa. It was built in 1977, so it is 48 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 3,109 vehicles a day, roughly 3% of them trucks, projected to reach 3,109 by 2043. The structure is 561 ft (171 m) long and 34 ft wide.

Location

Open in Google Maps
CarriesKenyon RD NB
CrossesDm River & B Ave
Location1.3 MI N of S JCT US 169
RouteCity Street 0
CountyWebster County
StateIowa
Coordinates42.49386, -94.18915
Functional classUrban Other Principal 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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length561 ft (171 m)
Longest span136 ft (41.5 m)
Deck width34 ft (10.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,109 (2022)
Projected traffic3,109 by 2043
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Kenyon RD NB over Dm River & B Ave built?

It was built in 1977, making it 48 years old in 2025.

What condition is Kenyon RD NB over Dm River & B Ave 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 Kenyon RD NB over Dm River & B Ave carry?

About 3,109 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Kenyon RD NB over Dm River & B Ave?

The structure is 561 ft (171 m) long with a longest span of 136 ft (41.5 m) and a deck 34 ft wide.

Who owns Kenyon RD NB over Dm River & B Ave?

It is owned by the State Highway Agency.