Santiam Pass: Sweet Home to Sisters
72 miles of US 20 between Sweet Home and Sisters, crossing Santiam Pass (4,817 ft) along the South Santiam River. Narrow and winding through Cascadia and the pass itself; corners tighten enough that carrying too much speed puts riders into the gravel shoulder.
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Stays open year-round unlike McKenzie Pass nearby, but ice and sudden weather changes are real between October and March — check current conditions before a winter trip. Check current access · Reviewed 2026-09-23
Planning the drive
US 20 runs 97 counted bends over 71.7 miles at a 1.4 per mile density — the lowest of any Oregon road in this catalog, reflecting a long approach through Cascadia before the real mountain crossing near the summit. Our own measured high point came back at 4,825 ft against the pass's documented 4,817 ft, essentially exact. Corners tighten enough near the pass that carrying too much speed puts you in the gravel shoulder. Wikipedia: Santiam Pass
Unlike McKenzie Pass just to the south, Santiam Pass stays open year-round — but ice and sudden weather changes are real here between October and March, and conditions can shift faster than they do at lower elevations nearby. Check current conditions before a winter trip rather than assuming the road being open means it's clear.
Roads to connect
- McKenzie Pass · OR 242The two byways combine into the McKenzie Pass–Santiam Pass Scenic Byway loop.
Driving notes updated .
Road shape
- Length
- 71.7 mi
- Bends
- 97
- Switchbacks
- 11
- Bends per mile
- 1.4
- Turning per mile
- 135°
- Curviest rank
- 147of 165
Measured from the OpenStreetMap centreline at a 20 m sampling step — road shape only, not a safety or speed judgement. How bends are counted.
Elevation
- Total climb
- 9,661ft
- Climb per mile
- 135ft
- Highest point
- 4,825ft
- Steepest grade
- 5.6%
Sampled every 100 m from USGS 10 m elevation data, a public-domain federal dataset. Total climb counts vertical change in both directions, so it does not depend on which way you drive. How elevation is measured.
Speed limits
Varies
Unverified
Check posted signs along the road.
No reliable posted limit was found for this selected section. Follow current signs.
Posted signs always govern. How speed evidence is handled.
Sources
Difficulty 2/3 (Winding) is our editorial rating of width, bends and sightlines; “Medium speed” describes character, not a target speed. Full method. Identified from:
- Wikipedia: Santiam Pass
- TripCheck: McKenzie Pass–Santiam Pass Scenic Byway
- OpenStreetMap road data (37 ways in this trace)
Reviewed 2026-09-23. The trace shows selected road sections, not a navigation route.
Roads nearby
Distances are approximate straight lines between road centers, not driving distances or direct connections.