bridge ▁Lock ▁it ▁is ▁also ▁possible ▁to ▁visit ▁the ▁Lincoln shire ▁W olds , ▁using ▁the ▁Stone bridge ▁D rain ▁and ▁the ▁East ▁Fen ▁and ▁West ▁Fen ▁C atch water ▁Dra ins . ▁ ▁There ▁is ▁still ▁a ▁right ▁of ▁navigation ▁on ▁Cow bridge ▁D rain ▁and ▁Hob hole ▁D rain , ▁but ▁they ▁are ▁isolated ▁from ▁the ▁rest ▁of ▁the ▁system ▁by ▁the ▁der el ict ▁East ▁Fen ▁Lock . ▁Rest oration ▁of ▁this ▁lock ▁was ▁proposed ▁by ▁the ▁Lincoln shire ▁Branch ▁of ▁the ▁In land ▁Water ways ▁Association ▁in ▁ 1 9 7 5 , ▁who ▁sought ▁to ▁encou rage ▁use ▁of ▁the ▁dra ins ▁by ▁offering ▁a ▁pla que ▁to ▁boats ▁that ▁used ▁Cow bridge ▁Lock , ▁but ▁no ▁progress ▁has ▁been ▁made ▁with ▁this , ▁and ▁the ▁lock ▁has ▁been ▁in filled . ▁H agn aby ▁Lock , ▁near ▁the ▁top ▁of ▁the ▁West ▁Fen ▁C atch water ▁D rain ▁has ▁no ▁gates , ▁but ▁it ▁is ▁usually ▁possible ▁to ▁pass ▁straight ▁through , ▁while ▁the ▁lock ▁which ▁by pass ed ▁La de ▁Bank ▁p ump ing ▁station ▁on ▁the ▁Hob hole ▁D rain ▁has ▁been ▁converted ▁to ▁a ▁sl u ice . ▁ ▁In ▁addition ▁to ▁sudden ▁changes ▁in ▁water ▁levels , ▁there ▁are ▁a ▁number ▁of ▁very ▁low ▁brid ges ▁with ▁an ▁air ▁draft ▁of ▁less ▁than ▁, ▁which ▁can ▁cause ▁problems ▁if ▁the ▁water ▁levels ▁rise ▁a ▁little , ▁and ▁there ▁are ▁often ▁no ▁turning ▁places ▁at ▁the ▁end ▁of ▁the ▁dra ins . ▁Cru ising