Common dolphins are usually found in deeper water and stay out of smaller rivers.
There are events across South Kesteven over the next few weeks as part of the inaugural programme.
Anglian Water says the situation in Grantham and surrounding areas "should now be back to normal".
People in Grantham are among those impacted as Anglian Water says it is delivering bottled supplies.
The new solar farm could power 5,000 homes every year.
It was Michael Brunton's ambition for the villages of Allington and Boscombe to have their own hall.
