Marquette County Bridge Report Card

Marquette County scores 47 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F47 / 100

Local infrastructure snapshot

Marquette County, Michigan

Marquette County has 147 bridges in the National Bridge Inventory, with 19 rated poor and 35 rated scour-critical. Its poor-condition share of 12.9% is above the 11.0% statewide average. Poor-condition bridges carry about 16,076 daily vehicle crossings.

147Total Bridges

19Poor (12.9%)

59Fair (40.1%)

35Scour-Critical

Quote-Ready Local Facts

12.9%of county bridges are in poor condition, compared with 11.0% statewide and 6.7% nationally.

16,076daily vehicle crossings are on poor-condition bridges in the county.

35bridges are rated scour-critical, or 23.8% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Marquette County a Bridge Condition Exposure Score of 47/100 (F). The county has 147 bridges in the National Bridge Inventory, including 19 in poor condition and 35 rated scour-critical. Poor-condition bridges carry about 16,076 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	12.9%	25.9
Poor-condition traffic exposure	25	6.7% of measured traffic	5.0
Scour-critical bridge share	20	23.8%	20.0
Average age vs national baseline	10	52 years vs 48 nationally	1.8
Traffic-data completeness	5	241,388 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	12.9%
State Poor-Condition Share	11.0%
National Poor-Condition Share	6.7%
County Scour-Critical Share	23.8%
Average Bridge Age	52 years
Poor-Condition Traffic Exposure	16,076 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeM-553 over Canadian National Rr — 7,200 vehicles/day Oldest Listed BridgeCounty RD 601 over Michigamme River — built in 1911 All County BridgesBrowse every bridge record in Marquette County.

Top Bridges to Watch in Marquette County

Bridge	Reason	Condition	Daily Traffic	Year Built
County RD 581 over West Br Escanaba River	Poor condition + traffic exposure	Poor	900	1928
County RD 581 over Rocky Creek	Poor condition + traffic exposure	Poor	890	1940
County RD 557 over Little West River	Poor condition + traffic exposure	Poor	525	1928
Oc Road (old Us41) over Nelson Creek	Poor condition + traffic exposure	Poor	300	1935
Le Road over Trout Falls Creek	Poor condition + traffic exposure	Poor	140	1938
Kk Road over Salmon - Trout River	Poor condition + traffic exposure	Poor	137	1947
Jad Road (old M41) over Carp River	Poor condition + traffic exposure	Poor	100	1946
County RD 438 over N Br W Br Escanaba R	Poor condition + traffic exposure	Poor	67	1928
Eyz Road over E Branch Escanaba River	Poor condition + traffic exposure	Poor	40	1925
Lll Road (old M95) over Michigamme River	Poor condition + traffic exposure	Poor	10	1934

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.