'Go Wild in the River Witham' attracted hundreds of people on Sunday July 9 as fun activities, an array of river species and 'The Witham Treasure Trail' highlighted parts of the unique wildlife in the river.
The habitat improvements in the park, and those along the length of the River Witham were discussed while children engaged in craft workshops making fish and wildflower seed bombs.
Lincolnshire Rivers Trust's Russ Critchley said: "Thanks to all those who came along and showed so much enthusiasm learning about their river and to the volunteers who helped the day go so smoothly.
"We had a great time adding to people's knowledge and hopefully encouraged some new generations of enthusiasts to take an interest in rivers and their wildlife."
SKDC's Cabinet Member for Environment Cllr Dr Peter Moseley said: "This was another really well attended event at Wyndham Park, thank you if you supported it.
"We're always pleased to work with partner organisations with events such as this so we can educate residents around the important habitats that exist in their local parks."
The Environment Agency is currently undertaking the two months of the improvements supported by SKDC, Rivercare, Lincolnshire Rivers Trust, Wyndham Park Forum, The Heritage Lottery Fund and the BIG Lottery Fund.