The £7.5m renovation project at Ifield Mill Pond will finish under budget this month.
A spokesman for Crawley Borough Council said the 18-month project will cost around £1m less than expected.
Colin Lloyd, Cabinet member for Environmental Services and Sustainability, said: “This was vital renovation work and I would like to thank nearby residents for their patience during construction.
“I am delighted to see the environmental and recreational improvements which the project has brought.”
The construction work has included:
A new dam near Ifield Mill, including a new spillway with a pass for ducklings and cygnets and another for eels
New and improved footpaths, cycle paths and boardwalks, including a 310-metre boardwalk in the south pond
Fish and ducklings from the north pond relocated to the south pond to allow the draining of the north pond
De-silting of both the north and south ponds
An extra car park off Gossops Drive for 10 vehicles.
Clay to construct the new dam came from the bed of the north pond. This was replaced with some of the excavated silt, which has also been used to form a new island in the Mill Pond and extend the western bank of the south pond. The remaining silt was taken off site to improve agricultural land.
The council in 2011 consulted residents what enhancements they wanted to see in addition to the construction of a new dam. It was required following changes in legislation.
A council spokesman said almost 90 per cent of respondents wanted to maintain the natural area and wildlife.
They also wanted to keep the same volume of water in the Mill Pond to allow the restored Ifield Water Mill to continue working.
Mr Lloyd added: “The council takes very seriously its responsibilities for water way maintenance.”
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