Jefferson County Bridge Report Card

Jefferson County scores 89 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B89 / 100

Local infrastructure snapshot

Jefferson County, Idaho

Jefferson County has 125 bridges in the National Bridge Inventory, with 4 rated poor and 2 rated scour-critical. Its poor-condition share of 3.2% is at or below the 5.4% statewide average. Poor-condition bridges carry about 641 daily vehicle crossings.

125Total Bridges

4Poor (3.2%)

97Fair (77.6%)

2Scour-Critical

Quote-Ready Local Facts

3.2%of county bridges are in poor condition, compared with 5.4% statewide and 6.7% nationally.

641daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 1.6% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Jefferson County a Bridge Condition Exposure Score of 89/100 (B). The county has 125 bridges in the National Bridge Inventory, including 4 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 641 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	3.2%	6.4
Poor-condition traffic exposure	25	0.2% of measured traffic	0.1
Scour-critical bridge share	20	1.6%	3.2
Average age vs national baseline	10	52 years vs 48 nationally	1.7
Traffic-data completeness	5	329,328 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	3.2%
State Poor-Condition Share	5.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.6%
Average Bridge Age	52 years
Poor-Condition Traffic Exposure	641 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeN 4400 E (shelton) over Burgess Canal — 510 vehicles/day Oldest Listed BridgeN 2850 E Road over Butte Market Lake Canal — built in 1931 All County BridgesBrowse every bridge record in Jefferson County.

Top Bridges to Watch in Jefferson County

Bridge	Reason	Condition	Daily Traffic	Year Built
N 4400 E (shelton) over Burgess Canal	Poor condition + traffic exposure	Poor	510	1969
E 700 N RD over Butte Market Lake Canal	Poor condition + traffic exposure	Poor	61	1962
E 421 N over Lewisville Canal	Poor condition + traffic exposure	Poor	50	1960
2350 North over Camas Creek	Poor condition + traffic exposure	Poor	20	1972
SH 48 over Snake River Dry Bed	Scour-critical foundation rating	Fair	1,900	1980
I 15 Nbl over Camas Creek	Scour-critical foundation rating	Fair	1,700	1963
US 20 over Garfield Ucon Canal	High traffic	Fair	34,500	1972
US 20 over Burgess Canal	High traffic	Fair	28,500	1975
US 20 Eb-wb over SH 48;rigby Gs	High traffic	Fair	28,500	1976
US 20 Ebl & Wbl over Parks Lewisville Canal	High traffic	Fair	19,500	1975

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.