Monday, July 31, 1769
To the west of Alhambra

Gaspar de Portol√°
The 31st, we proceeded for four hours, near the camp we found much water with a great deal of pasture which had grown so tall that the animals had to jump in order to get through it. Here we rested for one day. We experienced six or seven severe earthquakes. In this valley we discovered, on the south side between two mountains, a spring that flowed like a river, giving evidence of deep soil.

Miguel Costansó
We left this camping-place at seven o'clock in the morning, and, crossing the ditch over which we had to lay a bridge on account of the depth, we travelled for two leagues to the west-northwest through fields of dry grass and thickets, which detained us for a long time as it was necessary to clear a path at every step. We crossed a very muddy stream and camped farther on in an open clear spot in the same valley, and close to a gap which was seen to the west. At half-past eight in the morning we experienced another violent earthquake.

Fray Juan Crespi Diary
At seven in the morning we set out and went west-northwest. We traveled about two leagues through brush and low woods, which delayed us for a long time, making it necessary to cut the brush down at every step that was taken. We crossed a very miry arroyo of running water, and halted a little farther on in a clear open space, in the same valley and near a pass that was seen to the west.(1) At half-past eight in the morning we felt another earthquake. We traveled about three and a half leagues.

(1) The exact location of this camp is unclear, but later entries make it clear that it wasn't far from the Los Angeles River. The "pass that was seen to the west" was probably the low pass between the west end of the San Gabriel Valley and the Los Angeles basin. Interstate Highway 10 and the Union Pacific Railroad both use that pass.

July 30 To or near Bassett, on the San Gabriel River
August 1 Day two west of Alhambra