US Bridges

X 99 over Yellow Spring Creek

Good

Des Moines County, Iowa · 071023504 · Structure no. 000000000023551

Built
2008
17 years old
Condition
Good
inspected September 2023
Type
Slab
Concrete Continuous
Length
153 ft
3 main spans
Daily traffic
970
2022 count
Owner
County
County Highway Agency

About this bridge

X 99 over Yellow Spring Creek is a concrete continuous slab carrying X 99 over Yellow Spring Creek in Des Moines County, Iowa. It was built in 2008, so it is 17 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 970 vehicles a day, roughly 11% of them trucks, projected to reach 970 by 2043. The structure is 153 ft (46.6 m) long and 33 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesX 99
CrossesYellow Spring Creek
Location071023504
RouteCounty Highway 0
StateIowa
Coordinates40.91158, -91.05571
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating59.6 US tons
Inventory rating46.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length153 ft (46.6 m)
Longest span59 ft (18 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic970 (2022)
Projected traffic970 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 Yellow Spring Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is X 99 over Yellow Spring Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does X 99 over Yellow Spring Creek carry?

About 970 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is X 99 over Yellow Spring Creek?

The structure is 153 ft (46.6 m) long with a longest span of 59 ft (18 m) and a deck 33 ft wide.

Who owns X 99 over Yellow Spring Creek?

It is owned by the County Highway Agency.