Most of the ones I use for commuting – Erewash and Nottingham canals – have been hard surfaced and they get a lot of use. If I add on the extra distance to take in the Long Eaton stretch and the river side past Trent Lock, the path is muddy, uneven, rutted and gets worse every winter.
I understand the reluctance to tarmac towpaths, but it offers a great chance to boost the amount of smooth, flat cycle paths for families, kids, commuters and cycle tourists, as well as other non-cycling user groups.
We have no more right to have sole choice of the surface of towpaths than we do for bridleways. However frustrating that might be sometimes.