I live right near Archibald/River Road in Eastvale and ride it frequently. Eastvale has great bike lanes around the city and on Archibald. The newly redone bike lines on Archibald have a buffer lane between the bike lane and traffic. Once you cross the River Road Bridge into Corona, the bike lanes are nill and the road is narrow and in rough shape. There's a MUP trail from Archibald that goes 3 miles over to Hamner avenue. It has both paved and gravel options. I ride that frequently to avoid all cars and get some gravel miles in. Look up "riverwalk trail Eastvale". You'll even get to see Desi Arnez's restored ranch along the river! The pics below are all from Riverwalk trail.