Of course it's all a question of 'balance'.
The Guardian article ends with -
"The Environment Agency says it is not unduly concerned, though. "While there are minimal short-term impacts to the ecology of watercourses, the salt intake is not prolonged enough to cause significant long-term damage," says a spokeswoman. "As salt from roads tends to enter watercourses during a thaw, the salt is diluted relatively quickly. We do sample streams in the spring and have found no evidence of significant impact on wildlife from river salt intake."
Certainly more desirable than just chucking piles of rock salt on top of snow (as happened on North Meadow Walk) is clearing the snow and adding minimal amounts of salt to stop surface water freezing.
It would of course help if there was a proper/regular patrol/maintenance regime for the off-road network that allowed local knowledge to build-up (e.g. locations prone to surface water/freezing) and other issues - glass, vandalism etc. dealt with.
As anyone using the Innocent Path much last year will have noticed, it was well into the summer before the verges were cut back.
Any tiny (unintentional) benefit to the wildlife was largely paid for by the inconvenience (and sometimes danger) caused to pedestrians. Of course (in some instances) cyclists should have been more patient/careful, but a properly managed core path network shouldn't be too much to ask for.
Before Services for Communities was created (a sensible combining of the 'direct action' bits of various Departments) I was at a 'focus' meeting.
I suggested to the new boss that he should consider having a few staff on bikes so that they could deal with the network quickly and efficiently. Needless to say I wasn't taken seriously.
On another occasion I offerrd to lend a local team an 8 Freight to try out. Would have been useful for carrying basic tools, removing litter etc. The idea was well received but I never heard anything more.
IF the council is about to find £70k for off-road routes perhaps 'gritting' shouldn't be the first priority.