For one, did you know that the world-champion beard grower is a dude from Walnut Creek, California?
Granting what has been said and that Walnut Creek contains very little water, the area seems to me unsuitable for a foundation.
The plain between Walnut Creek and Concord is described as being well covered with grass and grown with oak trees.
Water was scarce; no mention is made of crossing any creeks during the march until they arrived at Walnut Creek in the evening.
Tuesday, the 11th, we remained at Walnut Creek, in order to better the crossing of the creek and to consolidate the whole command.
Because the area of Walnut Creek has very little water, it does not seem to me suitable for founding a mission.