Harperrig Reservoir
artificial lake in West Lothian, Scotland, UK, on the Water of Leith
Harperrig Reservoir is a reservoir in West Lothian, Scotland, to the north of the Pentland Hills, four miles (6.4 km) south of Mid Calder. The Water of Leith flows through it, and nearby are Harlaw Reservoir and Threipmuir Reservoir. It has been proposed that the reservoir be designated as a local nature reserve to be managed by West Lothian Council.
History and usage
Harperrig Reservoir was created in 1860 as part of a scheme to improve the supply of drinking water to Edinburgh, its function being as a compensation reservoir to guarantee a supply of water to the mills along the course of the Water of Leith. The dam was raised in height in 1890. In 2006 ownership of the reservoir was transferred from Scottish Water to the City of Edinburgh Council, the Council undertook modifications to the outflow in 2007–2008 as part of the Water of Leith Flood Prevention Scheme so that the reservoir could be used to store flood water and regulate the downstream flow of the Water of Leith.
Description
Harperrig reservoir lies in the middle of a basin on the northwestern side of the Pentland Hills some 19 kilometres (12 miles) from south west of Edinburgh. The dam is 15.4 metres (51 ft) in height and is 120 metres (130 yd) in length. The reservoir holds 4,091,481 m3 (900,000,000 imp gal) of water and has a surface area of 94.4 hectares (233 acres).
Historical sites within the catchment
The catchment area of Hareprrig reservoir includes the Scheduled Ancient Monuments which lie on East Cairn Hill and West Cairn Hill which date from the Bronze Age.
This brief starts where responsible research should: with the source description of “Harperrig Reservoir” as artificial lake in West Lothian, Scotland, UK, on the Water of Leith. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the places & architecture register because the source frames it as artificial lake in West Lothian, Scotland, UK, on the Water of Leith. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated Jul 25, 2026. The linked authority identifier is Q5663476. Authority coordinates are 55.834, -3.444. 1 of 1 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 1860, 1890, 2006 and 2007.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Harperrig Reservoir”, its source revision and the description used here.
- Expand the search: follow Harperrig Reservoir primary sources, Harperrig Reservoir archive and Harperrig research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Harperrig Reservoir”?
- Which earlier names or jurisdictions may reveal additional records?
- Which authority defined the place, boundary or structure at the relevant date?
Search terms from this dossier
This entry incorporates text from “Harperrig Reservoir” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.