Yukon-Koyukuk County Bridge Report Card

Yukon-Koyukuk County scores 62 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D62 / 100

Local infrastructure snapshot

Yukon-Koyukuk County, Alaska

Yukon-Koyukuk County has 94 bridges in the National Bridge Inventory, with 8 rated poor and 19 rated scour-critical. Its poor-condition share of 8.5% is above the 7.5% statewide average. Poor-condition bridges carry about 462 daily vehicle crossings.

94Total Bridges

8Poor (8.5%)

45Fair (47.9%)

19Scour-Critical

Quote-Ready Local Facts

8.5%of county bridges are in poor condition, compared with 7.5% statewide and 6.7% nationally.

462daily vehicle crossings are on poor-condition bridges in the county.

19bridges are rated scour-critical, or 20.2% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Yukon-Koyukuk County a Bridge Condition Exposure Score of 62/100 (D). The county has 94 bridges in the National Bridge Inventory, including 8 in poor condition and 19 rated scour-critical. Poor-condition bridges carry about 462 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	8.5%	17.0
Poor-condition traffic exposure	25	1.9% of measured traffic	1.4
Scour-critical bridge share	20	20.2%	20.0
Average age vs national baseline	10	47 years vs 48 nationally	0.0
Traffic-data completeness	5	24,053 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	8.5%
State Poor-Condition Share	7.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	20.2%
Average Bridge Age	47 years
Poor-Condition Traffic Exposure	462 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeIrr:steese Highway over Crooked Creek — 110 vehicles/day Oldest Listed BridgeSterling L/ophir over Yankee Creek — built in 1937 All County BridgesBrowse every bridge record in Yukon-Koyukuk County.

Top Bridges to Watch in Yukon-Koyukuk County

Bridge	Reason	Condition	Daily Traffic	Year Built
Irr: Airfield RD over Gold Creek	Poor condition + traffic exposure	Poor	86	1972
Sterling L/ophir over California Creek	Poor condition + traffic exposure	Poor	45	1937
Sterling L/ophir over Spruce Creek	Poor condition + traffic exposure	Poor	45	1964
Irr:airport Road over Shageluk Slough	Poor condition + traffic exposure	Poor	11	1978
Happy Creek Road over Otter Creek	Poor condition + traffic exposure	Poor	10	1947
Irr:steese Highway over Crooked Creek	Poor condition + traffic exposure	Poor	110	1957
Dalton Highway over Hammond River	Poor condition + traffic exposure	Poor	110	1972
Sterling L/ophir over Takotna River	Poor condition + traffic exposure	Poor	45	1941
Steese Highway over Mammoth Creek	Scour-critical foundation rating	Fair	140	1971
Dalton Highway over Ft. Hamlin Hills Creek	Scour-critical foundation rating	Fair	140	1982

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.