Tampabiker on 6/25/2017 5:03:38 PM:
The rain was the remnants of tropical storm Cindy. The heavy rains were coming in bands diagonal to the Towpath. Some places got three inches but a city a few miles away didn't get much.
There was a light drizzle the whole day and we were sitting on the bench at the visitor center when we felt a few bigger drops. The weather App (Dark Sky) said heavy rains in 3 minutes lasting 40 minutes. So we ran into the little sandwich shop and ate lunch. The rain and wind picked up and a huge storm blew through so hard the rain was going sideways. We checked the weather radar and there was no rain just a few miles from us.
Summarizing, it is difficult to answer your question because it really depends on exactly where you were that got the big 3 inch rain whereas a few miles away got 0.1 inch.