Keystone over Unnamed Trib to Maple Rv

Fair

Ida County, Iowa · 088403504 · Structure no. 000000000365675

Built: 2011; 14 years old
Condition: Fair; inspected March 2023
Type: Culvert; Concrete Continuous
Length: 22 ft; 2 main spans
Daily traffic: 80; 2022 count
Owner: County; County Highway Agency

About this bridge

Keystone over Unnamed Trib to Maple Rv is a concrete continuous culvert carrying Keystone over Unnamed Trib to Maple Rv in Ida County, Iowa. It was built in 2011, so it is 14 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 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 80 vehicles a day, projected to reach 80 by 2043. The structure is 22 ft (6.7 m) long.

Location

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CarriesKeystone

CrossesUnnamed Trib to Maple Rv

Location088403504

RouteCounty Highway 0

CountyIda County

StateIowa

Coordinates42.39124, -95.46644

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.

Component	Rating	Meaning
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.
Culvert	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionMarch 2023

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

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating52.8 US tons

Inventory rating31.6 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans2

Design loadH 20

Structure length22 ft (6.7 m)

Longest span10 ft (3 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2022)

Projected traffic80 by 2043

Trucks0%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed—

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 proposedOther structural work, including hydraulic replacements

Estimated improvement cost—

NavigationNot applicable (no waterway)

Frequently asked questions

When was Keystone over Unnamed Trib to Maple Rv built?

It was built in 2011, making it 14 years old in 2025.

What condition is Keystone over Unnamed Trib to Maple Rv 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 March 2023.

How much traffic does Keystone over Unnamed Trib to Maple Rv carry?

About 80 vehicles per day (2022 count).

How long is Keystone over Unnamed Trib to Maple Rv?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns Keystone over Unnamed Trib to Maple Rv?

It is owned by the County Highway Agency.