I warmed up on a walk with Amber and then ran/walked my 3 mile course along the RR tracks. I ran (OK, jogged) 20 minutes of it in 5 minute increments and walked the rest.
All is well with the calf. Not a tinge of tightness or pain.
I will continued to go up slowly for another week or so. If I don't blow it, I should be up to normal by mid to late July.