There are now several more allocations of sidewalk and roadway space in Sacramento for restaurant outside dining, since my May 28 post (https://gettingaroundsac.blog/2020/05/28/restaurant-space/).
I have created an album on Flickr of my photos: https://www.flickr.com/photos/allisondan/albums/72157715113286843. I am not claiming that I have an exhaustive archive, there may well be other locations that I have not run across. Let me know if you know of others.
Most of the installations have been done reasonably well. I feel that it is better to place dining space in the parking lane, or even travel lane, rather than the sidewalk, however, if done well, using sidewalk is OK. Yesterday I did run across a completely illegal diversion on R Street. It is not legal to simply put up sidewalk closed signs without providing an ADA accessible pathway.

I reported it, and the city had removed it in less than 24 hours. Already underway though, were plans to close this section of street and allocate it to restaurant dining and pedestrians. Some bollard bases had already been installed, and more were being placed this morning. These bollards will allow the closure (to cars) of R Street between 15th and 14th, R Street between 14th St and 13th, 14th Street between R Street and Rice Alley (to the south). It may be that additional bollards bases will be placed to allow a more refined closure.
I assume that since bollard bases and bollards are being installed, rather than just construction/detour signs, it appears likely that the intent is that temporary closures will continue to be available past the pandemic.
There were contractor crews working this morning to set up tents for outdoor dining, in the section of R Street between 15th and 14th. It isn’t clear to me yet whether other sections of street are going to be closed (to cars) at this time, or if the bollard bases are just in preparation for future use.

This work is apparently a cooperative project between the city and R Street Partnership, but I do not know the role of each.
