Shingle Springs - cool - I did nearly all of the structural steel above you at Missouri Flats new shopping center a few years back.
It is my belief that most of the
trees we plant around the homestead and provide
water for
should be fruit trees rather than ornamental, and being California, nearly anything you plant will grow if provided the proper soil and water.
The gold country is pretty similar along the Mother Lode with the lower areas of it being pretty heavily influenced by heating from the valley. As cooler air flows from the mountains in the evening (heavier) it displaces the warm air from the valley and it comes up to us at night. I find that the frosts are just hard
enough that it is a bit hard to do well here with citrus. We have a lemon, and a lime but freezes and snow are a bit much for them. Not dead yet though.
What we do have... all trees (about 35 of them now with 20 new ones this year) are less than 5 years old with most being planted one to two years. Apricots - eating lots of them - peaches - producing first and second crops - pluot - 4 varieties - doing great- various plums - doing well - many types of apples - just getting first few apples - cherries - birds got the few there - 4 walnut trees this year - look OK - multiple plums on one tree - looking well -
Looks like most types of fruit trees will do well here and especially they like to be on
berms rather than down in the clay. A hole in the clay with a tree in it becomes a bathtub full of water drowning the
roots in the winter. Planting on berms on the hill side prevents water damavge to the roots and provides a flow of air in the winter preventing a lot of frost damage.
As you can see in the pix of my dog and berms in the winter, flow down the hill was not a problem with the berms there although there will be the occasional over run. I follow the contour of the ground to make the berms horizontal on the mountainside with only a slight slope in the direction I want water to flow. I put checks in the road to hold water in it to allow soaking in rather than running off. The grasses reached over 4 feet on the berms this year. We have only 6 inches to a couple of feet of what I consider top soil above the hard porphyry clay that is common along the mother lode. The porphyry will hold water for weeks if a hole is dug in it.
I took the top soil from the road area and piled it onto the tree berm to make more good soil for the trees. This captures the runoff and forces it to soak into the berm area. Grasses stabilize the berms in the fall then in the spring I clean the road and widen the berms between the trees. This fall the
native grasses will again grow on the berms in abundance. I don't seed them but they are well covered each fall with grass. Try to have the berms done before the first rains.
Note that neighbors are not a problem here but could be the source of complaints in higher population density areas. There are grading exemptions from most codes for farming, fire breaks, water source access roads - existing roads and
fence line access. This terrace system is for fire safety (ease of making a fire break), farming and
fence line access as well as access to a spring at the bottom of our property appx 1/4 mile away. We have 20 acres on this piece and go well down both sides of the ridge.
Keep in mind that you may want to have rain water storage ponds also.
Try to become familiar with your soil - does it really wash away or does it make a decent terrace and stay put. I thought washing might be a problem but it does not seem to be. Try to make sure that you contain runoff on your property. I read a story about a Chinese fellow that did the same as me. He said that water at the bottom of the hill is not a problem if you first take care of it at the top. He converted a dry area such as ours into a wetland with terraces, berms and swales etc. He had to prove to the government he did it to keep from getting fined for farming a wetland.
Wish I could find that story now. He had been imprisoned and when released he was sent to a piece of worthless land. Over about 20 years his methods completely changed the
land and made it useful and lush.
I would start at the top using the water there then work my way down to prevent problems. Start small then enlarge it as you can handle it each year.