Gilliam County Bridge Report Card

Gilliam County scores 79 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C79 / 100

Local infrastructure snapshot

Gilliam County, Oregon

Gilliam County has 35 bridges in the National Bridge Inventory, with 0 rated poor and 6 rated scour-critical. Its poor-condition share of 0.0% is at or below the 5.1% statewide average.

35Total Bridges

0Poor (0.0%)

19Fair (54.3%)

6Scour-Critical

Quote-Ready Local Facts

0.0%of county bridges are in poor condition, compared with 5.1% statewide and 6.7% nationally.

0daily vehicle crossings are on poor-condition bridges in the county.

6bridges are rated scour-critical, or 17.1% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Gilliam County a Bridge Condition Exposure Score of 79/100 (C). The county has 35 bridges in the National Bridge Inventory, including 0 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 0 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	0.0%	0.0
Poor-condition traffic exposure	25	0.0% of measured traffic	0.0
Scour-critical bridge share	20	17.1%	20.0
Average age vs national baseline	10	50 years vs 48 nationally	0.8
Traffic-data completeness	5	63,556 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	0.0%
State Poor-Condition Share	5.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	17.1%
Average Bridge Age	50 years
Poor-Condition Traffic Exposure	0 vehicles/day

Bridges to Watch

Oldest Listed BridgeI-84 (hwy 002) WB over Willow Creek West — built in 1954 All County BridgesBrowse every bridge record in Gilliam County.

Top Bridges to Watch in Gilliam County

Bridge	Reason	Condition	Daily Traffic	Year Built
Or 74 (hwy 052) over Willow Creek	Scour-critical foundation rating	Fair	193	1979
Barnett RD over Rock Creek	Scour-critical foundation rating	Fair	93	1957
Upper Rock CR Road over Rock Creek	Scour-critical foundation rating	Fair	58	1962
M. Rock Creek Ln. over Rock Creek	Scour-critical foundation rating	Fair	57	1960
Mikkalo Lane over Hay Creek	Scour-critical foundation rating	Fair	13	1964
Rhea Road over Willow Creek EB	Scour-critical foundation rating	Good	10	1987
I-84 (hwy 002) over Blalock Canyon RD	High traffic	Fair	14,269	1964
I-84 (hwy 002) over John Day River	High traffic	Fair	14,253	1963
I-84 (hwy 002) over Arlington Viaduct	High traffic	Fair	14,069	1964
I-84 (hwy 002) WB over Willow Creek West	High traffic	Fair	7,076	1954

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.