US Bridges

Standing Rock Road over US 30

Good

Linn County, Iowa · 1.6 MI E IA1/US30 Intrchg · Structure no. 000000000700525

Built
2018
7 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
235 ft
2 main spans
Daily traffic
128
2022 count
Owner
State
State Highway Agency

About this bridge

Standing Rock Road over US 30 is a prestressed concrete stringer/multi-beam or girder carrying Standing Rock Road over US 30 in Linn County, Iowa. It was built in 2018, so it is 7 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 128 vehicles a day, projected to reach 128 by 2044. The structure is 235 ft (71.6 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesStanding Rock Road
CrossesUS 30
Location1.6 MI E IA1/US30 Intrchg
RouteCounty Highway 0
CountyLinn County
StateIowa
Coordinates41.9036, -91.40007
Functional classUrban Local

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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length235 ft (71.6 m)
Longest span116 ft (35.4 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic128 (2022)
Projected traffic128 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Standing Rock Road over US 30 built?

It was built in 2018, making it 7 years old in 2025.

What condition is Standing Rock Road over US 30 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 Standing Rock Road over US 30 carry?

About 128 vehicles per day (2022 count).

How long is Standing Rock Road over US 30?

The structure is 235 ft (71.6 m) long with a longest span of 116 ft (35.4 m) and a deck 33 ft wide.

Who owns Standing Rock Road over US 30?

It is owned by the State Highway Agency.