Thursday, August 10, 1769
To two miles east of Piru (SRL 624, Warring Park, Piru).
California State Registered Landmark - 624 - Warring Park

Gaspar de Portolá
The 10th, undeceived in regard to the possibility of following the route to the northwest on account of the endless number of high and rugged mountains through which it was impossible to discover a pass, we resolved to descend to the shore which here runs to the west, and see if it was possible, as all of them ended at the shore, to avoid such great obstacles as were presented by these mountains. We have come three leagues through a gully which has sufficient pasture and water.

Miguel Costansó
We travelled for three leagues through the canyon which still ran in the same direction — west-southwest. We halted on the bank of the stream which, at the time of our arrival, flowed with considerable volume, but, shortly after, dried up with the heat of the sun just as the scouts told us they had noticed on the previous day. This peculiarity we afterwards observed in other streams; they flowed by night and became dry by day. All the soil of this canyon is very boggy, treacherous, and of a whitish color; the animals sank into it at every step. This canyon was given the name of Santa Clara.

Fray Juan Crespi
This day of San Lorenzo, after we two priests had said Mass and all the people had heard it, we set out at eight in the morning, following the valley west-southwest, and also the arroyo, which runs with a good stream of water, and has banks well grown with cottonwoods, live oaks, and willows. The land continues good, with plenty of grass, and is of large extent. The mountains on either side are very high and bare, but abundantly covered with grass. On the summits are seen some live oaks and pines. The range is very steep. After three leagues' march we stopped in the same valley on the banks of the arroyo, and found ourselves here without any village. The place was given the same name mentioned yesterday, Canada de Santa Clara. On arriving we found that the arroyo was flowing with plenty of water, but a little while afterwards we observed that it had dried up with the heat of the sun, sinking into the sand, of which it has a great deal in the large bed, which resembles a river. This peculiarity struck us, and we observed afterwards that other arroyos ran at night and dried up by day. We noticed in this valley that the earth was very spongy, insecure, and whitish, and that the animals sank in at every step.

August 9 Day two at Castaic Junction.
August 11 To Sespe Creek, just west of Fillmore.