Hi flower123, I wonder if you are going to do a local history on Lagmore Townland, as you are researching so well. I found you on Google well done.
Griffiths valuation 1862 has the list of all the inhabitants of the townland inc 4 Sinclairs etc I didnt check for Watson. The associated OS map on the website is based on the 1st revision and should show any mill pond, or small lake. I couldnt find the right one. As enormous books, the LinenHall Library has the first series OS 6inch to the mile scale for 1830's and its first revision about 1860's. etc
Lagmore Reservoir had 21 million gallons in 1920 see Owen History of Belfast, that strikes me as it must have really deep. While on books Jack Loudan wrote a book on the The story of Belfast Water or similar.
I have lost the source for this information
"Water supply, sewerage and sanitation.
As a result of the 1884 Act parts of the local townlands became involved with pipelines and reservoirs at Stoneyford and Lagmore to supply water to Belfast. A subsequent Act in 1889 resulted in the addition of Leathamstown reservoir and the establishment of the Belfast Water Commissioners (B.W.C.)" The acts should give more information.
A periodical article shows what has been built:- Journal Title: UA international: Article Title Expanding housing stock at Lagmore. Volume 18:
Issue (7) Page(s) pp47-48 Date July 2002 Content:-Text, photos. Organisation Belfast Improved Houses / BIH. Note(s) Phases 4 & 5 of this housing development; Subject(s) social housing ; flexible housing ; housing for disabled people. Copy in QUB Location Search QUB Library Catalogue
possibly other libraries.
A comment on what has been lost is from
www.planningni.gov.uk/.../bmap2015-techsupp11-countryside-vol1....
. Lands at Lagmore – BUA ‘whitelands’
This area of ‘whiteland’ rises steeply to 210 metres at the Barnfield Road, and is highly visible from numerous locations in the local and wider area, and it is an essential component of the setting of the Metropolitan Area. It is therefore considered that approximately 85 hectares of ‘whiteland’ at Lagmore is included as Green Belt for the following reasons:
• to protect the setting of the metropolitan area; and
• to safeguard surrounding countryside.
BBC NI news this year has a quote "Four houses were damaged, two badly, when a culverted river burst its banks at Lagmore Heights on the outskirts of west Belfast. Nearby streets were covered in mud. There is a picture see Google
Good luck on your search, I thought the photos great, JimG