Summit County Bridge Report Card

Summit County scores 61 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D61 / 100

Local infrastructure snapshot

Summit County, Colorado

Summit County has 63 bridges in the National Bridge Inventory, with 5 rated poor and 6 rated scour-critical. Its poor-condition share of 7.9% is above the 4.6% statewide average. Poor-condition bridges carry about 30,443 daily vehicle crossings.

63Total Bridges

5Poor (7.9%)

42Fair (66.7%)

6Scour-Critical

Quote-Ready Local Facts

7.9%of county bridges are in poor condition, compared with 4.6% statewide and 6.7% nationally.

30,443daily vehicle crossings are on poor-condition bridges in the county.

6bridges are rated scour-critical, or 9.5% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Summit County a Bridge Condition Exposure Score of 61/100 (D). The county has 63 bridges in the National Bridge Inventory, including 5 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 30,443 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	7.9%	15.9
Poor-condition traffic exposure	25	5.6% of measured traffic	4.2
Scour-critical bridge share	20	9.5%	19.0
Average age vs national baseline	10	43 years vs 48 nationally	0.0
Traffic-data completeness	5	538,828 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	7.9%
State Poor-Condition Share	4.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	9.5%
Average Bridge Age	43 years
Poor-Condition Traffic Exposure	30,443 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI 70 Ml Wbnd over Corral Creek — 10,000 vehicles/day Oldest Listed BridgeSlate Creek RD over Blue River — built in 1923 All County BridgesBrowse every bridge record in Summit County.

Top Bridges to Watch in Summit County

Bridge	Reason	Condition	Daily Traffic	Year Built
I 70 Ml Ebnd over Smith Gulch	Poor condition + traffic exposure	Poor	10,000	1977
I 70 Ml Ebnd over Guller Gulch	Poor condition + traffic exposure	Poor	10,000	1977
I 70 Ml Wbnd over Corral Creek	Poor condition + traffic exposure	Poor	10,000	1979
E. Keystone Rd. over Snake River	Poor condition + traffic exposure	Poor	433	1978
County Road 1813 over Blue River	Poor condition + traffic exposure	Poor	10	1938
Hamilton Creek RD over Blue River	Scour-critical foundation rating	Fair	483	1980
E. Independence Ro over Stream	Scour-critical foundation rating	Fair	0	1985
E. Independence Ro over Snake River	Scour-critical foundation rating	Fair	0	1985
W Independence Roa over Snake River	Scour-critical foundation rating	Good	0	2005
E. Independence Ro over Jones Gulch	Scour-critical foundation rating	Good	0	2014

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.