Jefferson County Bridge Report Card

Jefferson County scores 72 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C72 / 100

Local infrastructure snapshot

Jefferson County, Colorado

Jefferson County has 468 bridges in the National Bridge Inventory, with 30 rated poor and 18 rated scour-critical. Its poor-condition share of 6.4% is above the 4.6% statewide average. Poor-condition bridges carry about 789,811 daily vehicle crossings.

468Total Bridges

30Poor (6.4%)

279Fair (59.6%)

18Scour-Critical

Quote-Ready Local Facts

6.4%of county bridges are in poor condition, compared with 4.6% statewide and 6.7% nationally.

789,811daily vehicle crossings are on poor-condition bridges in the county.

18bridges are rated scour-critical, or 3.8% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Jefferson County a Bridge Condition Exposure Score of 72/100 (C). The county has 468 bridges in the National Bridge Inventory, including 30 in poor condition and 18 rated scour-critical. Poor-condition bridges carry about 789,811 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	6.4%	12.8
Poor-condition traffic exposure	25	9.7% of measured traffic	7.3
Scour-critical bridge share	20	3.8%	7.7
Average age vs national baseline	10	41 years vs 48 nationally	0.0
Traffic-data completeness	5	8,111,160 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	6.4%
State Poor-Condition Share	4.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	3.8%
Average Bridge Age	41 years
Poor-Condition Traffic Exposure	789,811 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeUS 6 Ml over SH 121 Ml — 101,000 vehicles/day Oldest Listed BridgePark Avenue over Bear Creek — built in 1926 All County BridgesBrowse every bridge record in Jefferson County.

Top Bridges to Watch in Jefferson County

Bridge	Reason	Condition	Daily Traffic	Year Built
Soda Lakes Road over Bear Creek	Poor condition + traffic exposure	Poor	291	1938
US 6 Ml over SH 121 Ml	Poor condition + traffic exposure	Poor	101,000	1972
I 70 Ml Wbnd over SH 391 Ml	Poor condition + traffic exposure	Poor	57,000	1967
I 70 Ml Ebnd over SH 391 Ml	Poor condition + traffic exposure	Poor	57,000	1967
I 70 WB Ramp over US 6 Ml	Poor condition + traffic exposure	Poor	53,000	1969
I 70 Ml Wbnd over West 20th AVE	Poor condition + traffic exposure	Poor	45,500	1968
I 76 Ml Ebnd over Marshall Street	Poor condition + traffic exposure	Poor	38,000	1980
I 76 Ml Wbnd over Marshall Street	Poor condition + traffic exposure	Poor	38,000	1980
I 76 Ml Ebnd over Ramp To SH 121 Ml	Poor condition + traffic exposure	Poor	38,000	1982
I 76 Ml Wbnd over Ramp To SH 121 Ml	Poor condition + traffic exposure	Poor	38,000	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.