Keweenaw County Bridge Report Card

Keweenaw County scores 77 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C77 / 100

Local infrastructure snapshot

Keweenaw County, Michigan

Keweenaw County has 12 bridges in the National Bridge Inventory, with 1 rated poor and 0 rated scour-critical. Its poor-condition share of 8.3% is at or below the 11.0% statewide average. Poor-condition bridges carry about 128 daily vehicle crossings.

12Total Bridges

1Poor (8.3%)

7Fair (58.3%)

0Scour-Critical

Quote-Ready Local Facts

8.3%of county bridges are in poor condition, compared with 11.0% statewide and 6.7% nationally.

128daily vehicle crossings are on poor-condition bridges in the county.

0bridges are rated scour-critical, or 0.0% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Keweenaw County a Bridge Condition Exposure Score of 77/100 (C). The county has 12 bridges in the National Bridge Inventory, including 1 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 128 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	8.3%	16.7
Poor-condition traffic exposure	25	1.2% of measured traffic	0.9
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	62 years vs 48 nationally	5.7
Traffic-data completeness	5	10,349 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	8.3%
State Poor-Condition Share	11.0%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	62 years
Poor-Condition Traffic Exposure	128 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeCliff Drive over Gratiot River — 128 vehicles/day Oldest Listed BridgeUs-41 over Fanny Hooe Creek — built in 1928 All County BridgesBrowse every bridge record in Keweenaw County.

Top Bridges to Watch in Keweenaw County

Bridge	Reason	Condition	Daily Traffic	Year Built
Cliff Drive over Gratiot River	Poor condition + traffic exposure	Poor	128	1935
Us-41 M-26 over Gratiot River	High traffic	Good	3,430	1953
Us-41 over East Branch Eagle River	High traffic	Fair	1,399	1932
M-26 over Silver River	High traffic	Good	1,100	2023
Us-41 over Fanny Hooe Creek	High traffic	Fair	899	1928
M-26 over Owls Creek Buried	High traffic	Good	849	1948
M-26 over Eagle River	High traffic	Fair	849	1987
M-26 over Central Creek	High traffic	Fair	849	1988
Lac La Belle RD over Montreal River	High traffic	Fair	558	1942
Gay Laclabelle RD over Little Gratiot River	High traffic	Fair	126	1959

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.