US Bridges

Ia 100 WB over Ellis RD Silver Creek

Good

Linn County, Iowa · 2.8 Mi. N of US 218/30 · Structure no. 000000000700640

Built
2016
9 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
602 ft
4 main spans
Daily traffic
3,150
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 100 WB over Ellis RD Silver Creek is a prestressed concrete stringer/multi-beam or girder carrying Ia 100 WB over Ellis RD Silver Creek in Linn County, Iowa. It was built in 2016, so it is 9 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 3,150 vehicles a day, roughly 5% of them trucks, projected to reach 3,150 by 2044. The structure is 602 ft (183.5 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIa 100 WB
CrossesEllis RD Silver Creek
Location2.8 Mi. N of US 218/30
RouteState Highway 100
StateIowa
Coordinates42.00204, -91.77469
Functional classUrban Other Principal 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length602 ft (183.5 m)
Longest span157 ft (47.9 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,150 (2022)
Projected traffic3,150 by 2044
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 100 WB over Ellis RD Silver Creek built?

It was built in 2016, making it 9 years old in 2025.

What condition is Ia 100 WB over Ellis RD Silver 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 January 2024.

How much traffic does Ia 100 WB over Ellis RD Silver Creek carry?

About 3,150 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Ia 100 WB over Ellis RD Silver Creek?

The structure is 602 ft (183.5 m) long with a longest span of 157 ft (47.9 m) and a deck 43 ft wide.

Who owns Ia 100 WB over Ellis RD Silver Creek?

It is owned by the State Highway Agency.