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Uh-oh. It is definitely not happy, and does resemble weed killer damage.

If it does happen to live through this, it will never look the same, and will not recover the dead growth. It will simply grow in a different spot and those patches will remain bare.

I would say that you will want to look into replacing the tree with one similar in height and stature if you want it to remain uniform.

This article will tell you more about what to do from here: https://www.gardeningknowhow.com/ornamental/trees/tgen/herbicide-tree-injury.htm

It is, indeed, a Spruce. Pinning down the cultivar will be quite difficult, however. Your best replacements will be one of three species: Picea pungens, Picea orientalis and Picea mariana.

All three are suitable for container growth.

Here is a link to our entire collection of Spruce articles: https://www.gardeningknowhow.com/category/ornamental/trees/spruce

I trimmed mine up off the ground for a 2 to 3 inch clearance at the 4 years old stage. The height varied on them a bit but all did just fine. I water them with a product called Super Thrive in the water after such trimmings to help them deal with any shock or stress from the trimming up.

Please accept our apologies, but we've not seen this question until now. Here is an article that will help: https://www.gardeningknowhow.com/ornamental/trees/colorado-blue-spruce/care-for-colorado-spruce.htm

No, the dead branches and needles will not grow back.
You can prune the dead plant material from the tree.
https://www.gardeningknowhow.com/ornamental/trees/colorado-blue-spruce/care-for-colorado-spruce.htm

Slow-release granulated conifer fertilizer works best. Here's an article on how to care for your tree:

https://www.gardeningknowhow.com/ornamental/trees/colorado-blue-spruce/care-for-colorado-spruce.htm