There IS a solution to this problem, I searched and purchased quite a few adapters but finally I got it to work:
1) Purchase this USB-C to Display Port adapter:
2) Purchase this Display Port to "Active Dual Link DVI". It is important that it is an active converter and not a passive one:
Sorry for the German pages but I am sure you can find it also in other countries' stores.
Connect that combination and also don't forget to connect the active converters power through USB.
If it starts with a scaled resolution, don't worry, there is a key combination (option or command scaled resolution) and you get the highest one.
Works like a charm!
I know it's pricey but I love my 30" Cinema Display.
I also got my old MOTU Firewire audio interface with apples TB3 to T2 and then TB2 to FW and an additional FW cable from Belkin to run.
Now I use my exact same setup as with my old MacPro but it's the MacBook Pro 15" with Touch bar. Logic Pro with a Project of 40+ Audio Tracks does put a load of 50% to the system :-)
If you need more info just answer here, I can help :-)
UPDATE: The following item is USB-C to Dual Link DVI-I (which can take DVI-D). No need for multiple adapters. Alas, this does not support the 30" Cinema Display, according to the product page:
"The USB-C to DVI adapter will not work with Apple Cinema Displays or the Dell 3007WFP. These monitors require a true DVI-D signal. Please
note this before purchasing"