It was suggested on another post that we start a specific thread for the Deadwood Rally (D3WR) under Spyder rides and events so here it is. First of all here are official links that might be useful:

https://www.d3wr.com/

https://southdakotarides.com/printable-maps

https://www.travelsouthdakota.com/

https://gfp.sd.gov/csp-scenic-drives/

http://www.safetravelusa.com/sd/login/ (site is for road conditions, ie Road destruction)

there is an app SD511 also