Appendix 2.

Diagnostic channel keys

Step-pool: SP_b

Degraded	Stable	Aggraded
Morphology:
No organized stone lines (due to erosional displacement)	Intact stone lines (clast steps with intervening pools)	No organized stone lines (due to depositional infilling)
Bed sediment:
Largely bedrock	Largely moss-covered bedrock	Largely bedrock
Banks:
Not eroded	Boulder, bedrock, turf, or roots	Banks cleaned of moss but not eroded (due to bedrock)
LWD:
Absent	Occasionally present with minimal influence on morphology	Absent