Hi Edmund,
On your Lincoln AA book, you will see the name and address of the club secretary. If you write to him requesting maps, and provide an SAE, i am sure he will send them to you and you will then have all the information you require.
As you can see from the Lincs AA book, it does not have room to showthe association waters. Joint Witham waters include The Witham, from Lincoln,(right bank)at Stamp end lock- to Bardney Lock, and from Bardney road bridge - upstream for approx half a mile. The W&DJAF has several holdings....but you must check for exclusions.
It also has the Witham from Bardney Bridgethrough to Boston, again, with exceptions.
Also , the Fossdyke canal from University road bridge to Torksey Lock
In addition, several other small waters including Sincil drain.