Not changing CA161 just yet, but here are the major items in the update package for which I'll shortly submit a pull request.
Endpoint and other label fixes
CA 70 and CA 70 (Business): north endpoint now CA70(48B), with exit 48 split in two to reflect that the business route ends at the north half-diamond interchange rather than midway between the north and south half-diamonds.
CA 151: west endpoint moved south from CHA18_N to DamVisCen point at south edge of Shasta Dam visitor center parking lot, where I saw postmile 0.00; CHA18_S => CHA18
CA 162 (Covelo): FH7 => ShoCrkRd (no FH7 signage at CA 162 end; anyway, I prefer intersecting roads/boundaries over continuation road names/numbers, the former better defines where the CA route ends)
CA 168Bis (Bishop): west end truncated to SabCamp
CA 169 (Klamath Glen): east end renamed TerRifRd
CA 191: north end renamed PeaRd
Unsigned routes deleted
CA 222 (Ukiah, to closed state hospital converted to a monastery)
CA 244 (Auburn Blvd. connector in Sacramento)
CA 283 (concurrent with part of US101Bus Rio Dell, which itself hangs on by a thread with just one route marker)
CA 710 (short stub in Pasadena, which South Pasadena residents are aggressively trying to keep disconnected from I-710)
Route splits
CA 84 (Rio Vista): truncated at Ryer Island ferry crossing, with rest of route moved to new ca.ca084rye (Ryer Island)
CA 160: relinquished segment in Sacramento removed, with northern remaining segment now ca.ca160 (North Sacramento), and southern segment now ca.ca160rio (Rio Vista); much of relinquished segment will be covered by well-signed US 40 Historic (Sacramento) route
CA 193: now separate segments, western segment ca.ca193 (Lincoln) and eastern segment ca.ca193geo (Georgetown), with unsigned connection over I-80 and CA 49 removed
CA 220: split at Ryer Island ferry crossing, with western segment now ca.ca220rye (Ryer Island) and eastern segment now ca.ca220 (Ryer)
@si404 -- new AmeRiv point at south end of CA 160 North Sacramento segment should be added, at least as hidden point, to US 40 Historic (Sacramento) file, to keep the two files synched.