There were obviously a few houses/families using the address in 1871
LINK to birth record #177 for Mary Ann CONNOLLY at 15 Dam Bank Sep 20 1871
LINK to birth record #110 for Francis O'NEILL at 5 Dam Bank also Sep 20 1871
LINK to birth record #149 for Thomas MORAN at 5 Dam Bank Oct 12 1871
For Thomas MORAN the informant was Elizabeth BURNS of 52 Linden St; she is the informant on several births and may have been a midwife rather than a relative
Linden St is not shown on the historic maps but there are none online for 1862-1900.
Linden Cottage was beside the reservoir
As previously mentioned it may have been a colloquial area reference, perhaps for a new street yet to be officially named or an area that had its name for just a short while.