US Bridges

Glass RD over I-380

Fair

Linn County, Iowa · 1.1 Mi. S of Jct. Ia 100 · Structure no. 000000000604310

Built
1980
45 years old, rebuilt 2021
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
380 ft
4 main spans
Daily traffic
4,855
2022 count
Owner
State
State Highway Agency

About this bridge

Glass RD over I-380 is a steel continuous stringer/multi-beam or girder carrying Glass RD over I-380 in Linn County, Iowa. It was built in 1980 and reconstructed in 2021, so it is 45 years old, younger 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 4,855 vehicles a day, roughly 2% of them trucks, projected to reach 4,855 by 2043. The structure is 380 ft (115.8 m) long and 81 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesGlass RD
CrossesI-380
Location1.1 Mi. S of Jct. Ia 100
RouteCity Street 0
CountyLinn County
StateIowa
Coordinates42.01182, -91.6671
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating74.5 US tons
Inventory rating44.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length380 ft (115.8 m)
Longest span113 ft (34.4 m)
Deck width81 ft (24.8 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,855 (2022)
Projected traffic4,855 by 2043
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
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 Glass RD over I-380 built?

It was built in 1980, making it 45 years old in 2025. It was reconstructed in 2021.

What condition is Glass RD over I-380 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 September 2023.

How much traffic does Glass RD over I-380 carry?

About 4,855 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Glass RD over I-380?

The structure is 380 ft (115.8 m) long with a longest span of 113 ft (34.4 m) and a deck 81 ft wide.

Who owns Glass RD over I-380?

It is owned by the State Highway Agency.