US Bridges

Ia 9 over Moon Creek

Fair

Lyon County, Iowa · 0.3 Mi. W of W Jct. US 75 · Structure no. 000000000034625

Built
1974
51 years old
Condition
Fair
inspected February 2023
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
3,180
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 9 over Moon Creek is a concrete continuous culvert carrying Ia 9 over Moon Creek in Lyon County, Iowa. It was built in 1974, so it is 51 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 3,180 vehicles a day, roughly 14% of them trucks, projected to reach 3,180 by 2042. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesIa 9
CrossesMoon Creek
Location0.3 Mi. W of W Jct. US 75
RouteState Highway 9
CountyLyon County
StateIowa
Coordinates43.43303, -96.20172
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.9 US tons
Inventory rating22 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,180 (2022)
Projected traffic3,180 by 2042
Trucks14%
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

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 Ia 9 over Moon Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is Ia 9 over Moon 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 February 2023.

How much traffic does Ia 9 over Moon Creek carry?

About 3,180 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is Ia 9 over Moon Creek?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m).

Who owns Ia 9 over Moon Creek?

It is owned by the State Highway Agency.