Salt is the unknown with me.

Crepe Myrtle will die back enough here I can't grow a 20 foot one.

Paperbark maple isbslow for me and MOBOT doesn't have any huge ones I remember.

U can get a decade or so out of many decorative conifers if 20 feet is the limit. I have some ~10 year old thuja o's which are about 14 feet. They will need removed in a few years.

I suppose it would depend how close to the lines your local electric utility allows vegetation. Here, if street access is available to a bucket truck, 10' below the lines is permitted. For voice and catv a couple feet. How wide is the area between the road and the sidewalk? Overhead road clearance is generally 14', less for sidewalk/pedestrians. Anyone else have stuff planted? A picture would help (this from someone who doesn't post pix lol).

Hippophae rhamnoides could cope with the conditions, including the salt. But it isn't a tree.

Oooh, maybe scrub that - I see it is invasive in some parts of Canada. You'd need to research it well.

any thoughts on amur maple?....seems to be a tough little tree

what about a smaller growing crabapple or blue point juniper.

I'd do an apple or similar on a dwarfing rootstock. But I prefer fruit over "useless" trees.

what about a cool peach?

I've been researching the same thing, but without such strict size limits. Some sources say serviceberry is salt tolerant. Dogwood? Holly?

No idea about the salt, but Heptacodium miconioides (Seven Son Flower) would fit the other parameters.

We've been using Amelanchier on streets-under wires-with reasonably good results. Regarding Amur maple, that is a right tough little tree, my only caveat being the voluminous-and 100% viable-seed production. Not on the order of buckthorn, where birds carry the seeds far and wide, you will just end up with a groundcover of Amur maple seedlings each and every growing season-under the tree more or less. Leastways, that's how the plant acts up here.

viper - what's your general location, and how wide is the tree lawn? Some of the serviceberries have an upright form (Cumulus, Spring Flurry) for narrow sites. Amur maple grows relatively wide with time, plus the invasiveness concern that tom mentioned.

location Allentown PA, Tree lawn 15 inches wide, soil neutral pH, on slope so good drainage