US Bridges

X 99 over Stoney Hollow Creek

Fair

Des Moines County, Iowa · 071023506 · Structure no. 000000000023540

Built
1936
89 years old, rebuilt 1990
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
1,170
2022 count
Owner
County
County Highway Agency

About this bridge

X 99 over Stoney Hollow Creek is a concrete continuous culvert carrying X 99 over Stoney Hollow Creek in Des Moines County, Iowa. It was built in 1936 and reconstructed in 1990, so it is 89 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 1,170 vehicles a day, roughly 13% of them trucks, projected to reach 1,170 by 2043. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesX 99
CrossesStoney Hollow Creek
Location071023506
RouteCounty Highway 0
CountyDes Moines County
StateIowa
Coordinates40.90574, -91.05544
Functional classRural 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating53.5 US tons
Inventory rating32.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length21 ft (6.4 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 traffic1,170 (2022)
Projected traffic1,170 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was X 99 over Stoney Hollow Creek built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1990.

What condition is X 99 over Stoney Hollow 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 September 2023.

How much traffic does X 99 over Stoney Hollow Creek carry?

About 1,170 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is X 99 over Stoney Hollow Creek?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns X 99 over Stoney Hollow Creek?

It is owned by the County Highway Agency.