I've been doing a lot of reading on the early history of Tempe and the mill. I found this quotation from a letter. What a different place Tempe must have been in 1877!
...Grain looks well and the indications are of a beautiful harvest, the soil is almost excellent producing crops in profusion, the water supply of the valley is ample, and the purity and softness of the water is proverbial. Here the young and vigorous man can advantageously plant themselves on rich farms an increase in means while the country is growing. Yours, Robert Daniels, 1877
Do you recognize this place?