Structure 9630A006 26030 · Union County, OR

I-84 (hwy 006) EB over Grande Ronde River

Carries I-84 (hwy 006) EB over Grande Ronde River, 1.1 E. Jct. US 30.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT302 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

302 ft end to end, longest span 80 ft: about 4 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a box-beam bridge.

Built197254 years old
Length301.8 ft92 m
Daily traffic5,882counted 2022
Last inspectedMay 2024every 24 months

Location

StateOregon
CountyUnion
Location1.1 E. Jct. US 30
CarriesI-84 (hwy 006) EB
CrossesGrande Ronde River
Coordinates45.34220, -118.09900

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length301.8 ft (92 m)
Max Span80.1 ft (24.4 m)
Deck Width44.6 ft (13.6 m)
Deck Area1251.2 sq m
Main Spans4
Year Built1972

Traffic

Avg Daily Traffic5,882 (2022)
Truck Traffic38%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number09630A006 26030

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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