For some reason the national forest boundaries on google map seem to be frequently wrong and also change over time (at least I've noticed some changes). Trinity

For some reason the national forest boundaries on google map seem to be frequently wrong and also change over time (at least I've noticed some changes). Trinity (CA) looks to be completely missing, as is a large portion of Gifford Pinchot or Okanogan-Wenatchee and maybe Snoqualmie (WA). Not sure why this happens.