Ketchikan Gateway County Bridge Report Card

Ketchikan Gateway County scores 37 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F37 / 100

Local infrastructure snapshot

Ketchikan Gateway County, Alaska

Ketchikan Gateway County has 107 bridges in the National Bridge Inventory, with 12 rated poor and 9 rated scour-critical. Its poor-condition share of 11.2% is above the 7.5% statewide average. Poor-condition bridges carry about 33,940 daily vehicle crossings.

107Total Bridges

12Poor (11.2%)

45Fair (42.1%)

9Scour-Critical

Quote-Ready Local Facts

11.2%of county bridges are in poor condition, compared with 7.5% statewide and 6.7% nationally.

33,940daily vehicle crossings are on poor-condition bridges in the county.

9bridges are rated scour-critical, or 8.4% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Ketchikan Gateway County a Bridge Condition Exposure Score of 37/100 (F). The county has 107 bridges in the National Bridge Inventory, including 12 in poor condition and 9 rated scour-critical. Poor-condition bridges carry about 33,940 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	11.2%	22.4
Poor-condition traffic exposure	25	31.1% of measured traffic	23.4
Scour-critical bridge share	20	8.4%	16.8
Average age vs national baseline	10	31 years vs 48 nationally	0.0
Traffic-data completeness	5	109,014 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	11.2%
State Poor-Condition Share	7.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	8.4%
Average Bridge Age	31 years
Poor-Condition Traffic Exposure	33,940 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeSouth Tongass HWY over Water ST Viaduct — 14,046 vehicles/day Oldest Listed BridgeSouth Tongass HWY over Forks Creek — built in 1938 All County BridgesBrowse every bridge record in Ketchikan Gateway County.

Top Bridges to Watch in Ketchikan Gateway County

Bridge	Reason	Condition	Daily Traffic	Year Built
South Tongass HWY over Water ST Viaduct	Poor condition + traffic exposure	Poor	14,046	1955
South Tongass HWY over Hoadley Creek	Poor condition + traffic exposure	Poor	11,900	1957
North Tongass HWY over Ward Creek	Poor condition + traffic exposure	Poor	5,250	1975
Park/harris ST over Ketchikan Creek	Poor condition + traffic exposure	Poor	2,512	1957
Shelter Cove Road over Harriet Hunt Creek	Poor condition + traffic exposure	Poor	125	1981
Sayles/gorge ST over Sayles/gorge Viaduct	Poor condition + traffic exposure	Poor	40	1960
Peterson Street over Peterson Street	Poor condition + traffic exposure	Poor	30	1955
Harding Street over Harding Street	Poor condition + traffic exposure	Poor	30	1968
8400000 over Trail # 828400shoal	Poor condition + traffic exposure	Poor	5	1992
No Data Entered over Perm	Poor condition + traffic exposure	Poor	2	1997

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.