Ordnance Survey Levelling Lines

Browse historic levelling campaigns across England, Wales and Scotland. Select a line to explore its recorded benchmarks, or view the lines together on the interactive map.

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129Lines listed
6,951Total marks
364Marks in database
5.2%Overall recorded

First Primary Levelling, England & Wales (1840–60)

9 lines
Line Name Total Marks Marks in DB Percentage Logged
Carlisle to North Shields * 213 48
22.5%
Carlisle to Sark Bridge * 34 1
2.9%
Darlington to Scarborough (Acklam to Middlesbrough) * 15 4
26.7%
Liverpool to Port Carlisle * 579 2
0.3%
Newcastle-upon-Tyne to Berwick-upon-Tweed * 216 31
14.4%
Newcastle-upon-Tyne to Crailing * 116 4
3.4%
North Shields to Stockton-upon-Tees * 91 6
6.6%
Selby to Newcastle-upon-Tyne * 301 22
7.3%
York to Bridlington * 133 3
2.3%

First Primary Levelling, Scotland (1844–60)

6 lines
Line Name Total Marks Marks in DB Percentage Logged
Berwick-upon-Tweed to Edinburgh * 159 3
1.9%
Crailing to Longtown * 92 1
1.1%
Hawick to Berwick-upon-Tweed * 93 7
7.5%
Kilmarnock to Glasgow * 265 1
0.4%
Stranraer to Glasgow * 279 1
0.4%
Tranent to Berwick-upon-Tweed * 93 1
1.1%

Second Geodetic Levelling, England & Wales (1912–21)

36 lines
Line Name Total Marks Marks in DB Percentage Logged
Bromsgrove to Suckley 42 1
2.4%
Bromsgrove to Warwick 44 1
2.3%
Buntingford to Clare 68 1
1.5%
Castor to Wicken 44 1
2.3%
Daresbury to Wrexham 39 1
2.6%
Flax Bourton to Sharpness 32 1
3.1%
Forcett to Wolsingham 27 2
7.4%
Grampound to Troon 20 1
5.0%
Hawick to Kelso 35 4
11.4%
Hemel Hempstead to Buntingford 39 1
2.6%
Hexham to Longhorsley 26 3
11.5%
Hibaldstow to Matlock 69 1
1.4%
Hibaldstow to South Cave 40 1
2.5%
Kelso to Duns Common 29 7
24.1%
Kirkby Stephen to Penrith 25 1
4.0%
Liverpool to Daresbury 40 1
2.5%
Longhorsley to Belford 34 2
5.9%
Macclesfield to Daresbury 50 1
2.0%
Mordington to Belford 16 2
12.5%
Navenby to Hibaldstow 21 1
4.8%
Newlyn (Tolcarne) to Observatory 6 2
33.3%
Newlyn Circuit (2nd) 15 4
26.7%
North Petherton to Dulverton 45 1
2.2%
North Petherton to Flax Bourton 43 2
4.7%
Northallerton to Forcett 38 2
5.3%
Ribblesdale to Kirkby Stephen 23 1
4.3%
Snodland to Wye 2 1
50.0%
South Shields to Hexham * 158 17
10.8%
Thornford to North Petherton 33 1
3.0%
Troon to Newlyn (Tolcarne) 24 2
8.3%
Upton Lovell to Flax Bourton 53 1
1.9%
Wetherby to Bulmer 39 4
10.3%
Wicken to Clare 29 1
3.4%
Wolsingham to Hexham * 21 9
42.9%
Wolsingham to Kirkby Stephen 33 2
6.1%
Wye to Guestling 29 1
3.4%

Second Geodetic Levelling, Scotland (1936–52)

13 lines
Line Name Total Marks Marks in DB Percentage Logged
Buittle to Dalry 14 1
7.1%
Dalry to Thankerton 50 1
2.0%
Dunlop to Milngavie 30 1
3.3%
Edinburgh to Innerleithen 13 1
7.7%
Edinburgh to Linlithgow 24 1
4.2%
Lairg to Loch Naver 4 1
25.0%
Lairg to Tain 15 1
6.7%
Laxford Bridge to Durness 4 1
25.0%
Ledmore to Laxford Bridge 5 1
20.0%
Necropolis to Dunlop 69 1
1.4%
New Cumnock to Dalry 27 1
3.7%
Ullapool to Lairg 21 1
4.8%
Whittingehame to Edinburgh 22 1
4.5%

Third Geodetic Levelling, England & Wales (1950–68)

51 lines
Line Name Total Marks Marks in DB Percentage Logged
Belford to Longhorsley 36 2
5.6%
Bromsgrove to Warwick 38 1
2.6%
Buntingford to Great Linford 57 1
1.8%
Carmarthen to Haverfordwest 42 1
2.4%
Church Stretton to Bromsgrove 67 1
1.5%
Clare to Wicken 31 1
3.2%
Cockermouth to Wetheral 46 1
2.2%
Countisbury to North Petherton 44 1
2.3%
Cowbridge to Bishopston 40 1
2.5%
Croydon to Buntingford 67 1
1.5%
Daresbury to Liverpool 30 1
3.3%
Dulverton to North Petherton 38 1
2.6%
Duns Common 28 5
17.9%
Flax Bourton to Sharpness 39 1
2.6%
Flax Bourton to Upton Lovell 54 1
1.9%
Forcett to Northallerton 44 2
4.5%
Hatfield Peverel to Buntingford 41 1
2.4%
Haverfordwest to Cardigan 71 1
1.4%
Haverfordwest to Carmarthen 84 1
1.2%
Hexham to Hawick 71 7
9.9%
Hexham to Wolsingham 38 11
28.9%
Hibaldstow to Navenby 31 1
3.2%
Immingham to Hibaldstow 22 1
4.5%
Isle of Thanet to Guestling 56 1
1.8%
Kelso to Hawick 30 3
10.0%
Kirkby Stephen to Ribblesdale 40 1
2.5%
Longhorsley to Hexham 35 4
11.4%
Macclesfield to Daresbury 46 1
2.2%
Madron to Troon 19 2
10.5%
Maybush Circuit 11 1
9.1%
Maybush to Winchester 22 1
4.5%
Mickleby to Longhorsley 115 18
15.7%
Mordington to Belford 24 2
8.3%
Newlyn Circuit (3rd) 21 5
23.8%
North Petherton to Flax Bourton 43 2
4.7%
Northallerton to Mickleby 50 2
4.0%
Oswestry to Daresbury 63 1
1.6%
Penhow to Cowbridge 39 1
2.6%
Penrith to Kirkby Stephen 36 1
2.8%
Snodland to Isle of Thanet 79 1
1.3%
Snodland to Wye 45 1
2.2%
South Cave to Hibaldstow 52 1
1.9%
Troon to Boscastle 68 1
1.5%
Troon to Grampound 23 1
4.3%
Tynemouth Loop 7 5
71.4%
Wasdale to Cockermouth 36 1
2.8%
Wetheral to Hexham 42 7
16.7%
Wetherby to Bulmer 42 3
7.1%
Wicken to Castor 49 1
2.0%
Wolsingham to Forcett 43 2
4.7%
Wye to Guestling 35 1
2.9%

Third Geodetic Levelling, Scotland (1956–68)

14 lines
Line Name Total Marks Marks in DB Percentage Logged
Dalry to Ayr 39 1
2.6%
Dalry to Buittle 20 1
5.0%
Edinburgh to Linlithgow 36 1
2.8%
Edinburgh to Whittingehame 33 1
3.0%
Glen Cluanie to Glen Moriston 30 1
3.3%
Glen Moriston to Loch Tarff 14 1
7.1%
Glen Moriston to Scourguie 30 1
3.3%
Gourock to High Boydston 29 1
3.4%
High Boydston to Ayr 40 1
2.5%
High Boydston to Dunlop 18 1
5.6%
Laxford Bridge to Durness 26 1
3.8%
Ledmore to Laxford Bridge 40 1
2.5%
Milngavie to Bowling (via Govan) 35 2
5.7%
Rosyth to Edinburgh 23 1
4.3%

* Total Marks Correct and line is ready to find.

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