Queen’s Valley Reservoir is reopening following a three-month closure to tackle a rat infestation.
The top car park and entrance can be used again from today (4 July).
Jersey Water sealed it off in April because the area was over-run with rats.
The utility has been trying to deal with a small number of visitors who are persistently feeding the wildlife, drawing the rodents.
Read: 'Really disappointing' ongoing part-closure of Queen's Valley reservoir
Jersey Water say the rat numbers are 'significantly reduced' and 'under control', but it will have to keep a close eye on the situation.
Mark Bowden told Channel 103:
"We are really pleased to be able to reopen Queen's Valley, because we know how much it is valued by the community.
"The closure hasn't had the effect that we would like because people have been circumventing the fencing and the closure of the gates that we have had in place.
"We are working with the police and the public health department to try and get some measures and support that will help us to manage the problem that we have got there.
We are still appealing to people not to take any food up to Queen's Valley and not to be feeding the wildlife because the (rat) population is quite problematic."

Jersey Prison Service launches training project with Jersey Bulls
Lifeboat crews rescue power-outed motor boat in thick fog
Girl (14) flown to UK following crash in St Brelade
Patients recalled after concerns over hospitals' bone density scans
'Initial' but no 'material' improvements in SEND provision in Jersey
DFDS brings in the Côte d’Albâtre for Easter weekend only
Digital travel permissions extended to Channel Islands this month
Independent review to look into Jersey work permit system