A Guernsey preservation group wants listed status for the Water Lanes and the stream near the Vale Church.
La Societe met earlier this week at senior level to discuss the recent move by Education to cover over sections of the St Peter Port Water Lanes.
It was a planning criteria for the new post 16 campus at Les Ozouets to enable both walkers and cyclists through the partly car free lanes.
Currently, no cycling signs are in place because the walkway is too narrow for both.
The move caused a backlash and the plan is on hold while Education looks at alternatives.
Trevor Bourgaize, president of La Societe, says they are a valuable natural and historical asset:
"We are very much of the opinion that nothing should be done to alter it, as it is now.
"Not only on environmental grounds, there are some interesting plants there and it has sticklebacks still in it, they were in it when I was a kid.
"But also the historic value of it, feeding La Vrangue Mill.
"We want to see it protected as it is but also listed so in the future nothing can be done that would be to the detriment of it."
He says they may also consider listing another substantial stream, near the Vale Church:
"We're going to go through the list that we prepared some time ago and suggest that not only the Water Lanes should be protected but other ones as well."
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