US Bridges

US 30 WB over Slip Bridge Ramp

Good

Tama County, Iowa · 1.8 Miles West of US 63 · Structure no. 000000000609950

Built
2010
15 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
158 ft
3 main spans
Daily traffic
7,600
2023 count
Owner
State
State Highway Agency

About this bridge

US 30 WB over Slip Bridge Ramp is a prestressed concrete stringer/multi-beam or girder carrying US 30 WB over Slip Bridge Ramp in Tama County, Iowa. It was built in 2010, so it is 15 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,600 vehicles a day, roughly 16% of them trucks, projected to reach 7,600 by 2043. The structure is 158 ft (48.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 30 WB
CrossesSlip Bridge Ramp
Location1.8 Miles West of US 63
RouteU.S. Route 30
StateIowa
Coordinates41.99209, -92.61317
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.3 US tons
Inventory rating53.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length158 ft (48.3 m)
Longest span56 ft (17.2 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,600 (2023)
Projected traffic7,600 by 2043
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 30 WB over Slip Bridge Ramp built?

It was built in 2010, making it 15 years old in 2025.

What condition is US 30 WB over Slip Bridge Ramp 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 January 2024.

How much traffic does US 30 WB over Slip Bridge Ramp carry?

About 7,600 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is US 30 WB over Slip Bridge Ramp?

The structure is 158 ft (48.3 m) long with a longest span of 56 ft (17.2 m) and a deck 44 ft wide.

Who owns US 30 WB over Slip Bridge Ramp?

It is owned by the State Highway Agency.