Reading Contour Lines to Judge Steepness

Start with the Map on the Cottage Table

You’ve got a week in a Lakeland cottage, boots by the door and a kettle coming to the boil. Before you choose a fell, spread the map out. Contour lines are the most useful weather-proof language on the sheet: they tell you where the ground is gentle, where it rears up, and where a seemingly short route will turn into a hands-on scramble. Check the map legend first. A 1:25,000 sheet might use 5m or 10m contours; a 1:50,000 sheet usually uses 10m.

What Contour Spacing Really Tells You

Contours join points of equal height. When they crowd together, the ground rises or falls quickly. When they drift apart, the slope is gentle. But “crowded” is relative. On a 1:25,000 map, 1cm on the paper equals 250m on the ground. So if 10m contours sit 1mm apart, you have 10m of ascent over 25m of ground. That is a 40% gradient — about 1 in 2.5. If the same contours are 5mm apart, the rise is spread over 125m, giving an 8% gradient. On a 1:50,000 map, 1mm equals 50m, so 1mm spacing gives a 20% gradient — still steep, but not the same monster. Always measure the gap and check the scale.

Use a simple rule: gradient = rise divided by horizontal distance. A 10m rise over 100m is 10% (1 in 10). Over 50m it is 20% (1 in 5). Over 25m it is 40% (1 in 2.5). On the fells, anything steeper than about 25% will slow you dramatically, especially in wet grass or loose rock. If contours touch or merge, assume crag or near-vertical ground. Do not plan a descent there unless you know it is a sanctioned scramble.

Reading Crags, Re-entrants and Spurs

Look for shapes, not just spacing. A band of tightly packed contours running across a slope often marks a crag or rocky step. Black hachures or rock symbols confirm it. These are places to avoid unless you are deliberately scrambling. A re-entrant — a gully or small valley cutting into the hillside — appears as a V-shaped kink in the contours. The V points uphill, into the higher ground. Re-entrants can be steep, loose, wet and difficult to escape. A spur or ridge nose shows the opposite: a V pointing downhill. Spurs often give firmer, drier and easier going. If you need to gain height, aim for the broad back of a spur rather than the dark line of a re-entrant.

• Tight contours + rock symbols = crag. Treat as a barrier.
• V pointing uphill = re-entrant or gully. Expect steep, broken ground.
• V pointing downhill = spur or ridge. Usually the better line.
• Contours bending around a bowl = corrie. Steep headwall, often crags.

Finding the Easier Ridge

An easier ridge often shows as a broad tongue of land with contours that are evenly spaced and not bunched. The sides may be steeper, but the crest itself is gentle. Look for a ridge that starts low and widens as it climbs. Avoid a ridge that narrows into a knife-edge, where contours on both sides squeeze together. That is the signature of an arête, and it demands a head for heights and often hands-on movement. On a Lakeland ascent, a good plan is to go up a ridge and come down a different one, so you are always reading new ground. If the contours suggest a convex slope — steeper at the bottom, easing near the top — you may not see the summit until late. A concave slope, steeper at the top, can hide a nasty surprise above you.

From Map to Ground: What Contours Don't Show

Contours are honest about height, but they say nothing about bog, heather, bracken, scree or the quality of a path. A gentle-looking area can be a tussocky nightmare; a steep-looking slope may have a well-made zigzag path. In the Lake District, many popular routes take the easiest line, and that line is often visible on the map as a path symbol. But do not follow a path blindly. Use contours to confirm that the path is going where you think. If the map shows a crag and you can see a dark band ahead, believe the map. If cloud comes down, contours become your best friend. Set a compass bearing, time your legs, and use an altimeter if you have one. When you reach a contour feature — a spur, a re-entrant, a change in spacing — you can fix your position. Often it is better to lose a little height and find a spur.

Planning a Lakeland Day from the Cottage Door

Back at the cottage, make a routine. Spread the map, mark the start and finish, and highlight every section where contours are tight. Identify escape routes: a broad ridge, a valley path, a forest track. Estimate time using Naismith’s rule — roughly 1 hour per 5km, plus 1 hour for every 600m of ascent. That is 1 minute for every 10m of climb. If the map shows 1 in 3, do not expect to keep guidebook pace. Pack for the day you might get, not the day you want. A headtorch, spare layer, food and water are not optional. Tell someone your plan. And remember that a cottage holiday is about enjoyment, not survival. If the contours are telling you the route is beyond your comfort, choose another. The fells will still be there tomorrow, and the tea and cake will taste better for it.