How to Find the Grantham Canal’s Historic Winding Holes

A winding hole beside a canal is easily mistaken for a pond, puddle or flooded clay pit. Along the Grantham Canal, it may mark where engineers cut a straighter section across a bend, leaving the abandoned curve as a short, rounded stub. That stub once allowed a narrow boat to turn without reversing its entire length. Finding these survivals reveals how a working waterway negotiated the land.

The roughly 22-mile, or 35-kilometre, route links Grantham with the Trent near Hough-on-the-Hill, passing villages and rolling countryside north of the town. Its winding holes and other turning places were practical features of an industrial canal rather than ornamental ponds. Their traces are easiest to understand when the old alignment, the current towpath and surviving field boundaries are considered together.

Finding them requires three layers of evidence: a historical map, a modern location reference and careful inspection on the ground. This approach works for walkers, cyclists, boaters and researchers. It also prevents a convincing dip in a field from being labelled a canal feature without supporting evidence.

Know the difference between winding holes and turning places

A winding hole normally appears where the canal’s earlier line curved around rising ground or a property boundary and a later alignment cut across the neck of that curve. The old route may survive as a water-filled crescent, an elongated hollow or merely a damp depression. A broad end to a straightened reach can also indicate that craft once manoeuvred there.

Turning point is used more loosely. It may describe a winding hole where a boat could reverse direction, a formal turning basin beside a lock or terminus, or a pronounced bend that required careful handling. These features should not be treated as interchangeable. A winding hole is tied to the canal’s earlier geometry, while a turning basin was deliberately made broad enough for manoeuvring.

For every candidate, record the visible water or hollow, the direction of the nearest bank, its relationship to the current canal and the grid reference. Note whether the feature appears on an old map, appears in aerial photographs or is visible only as a crop or drainage mark. That evidence makes the site much easier to verify later.

Begin with maps made before restoration

Historic Ordnance Survey maps are the most useful starting point. The six-inch County Series and later twenty-five-inch maps often show the canal more clearly than modern tourist mapping. Look for a broad arc of waterway that no longer joins the present channel, especially where a straight section crosses a field diagonally. Compare several editions because a feature may have become clearer after one bend was abandoned and another was enlarged.

Local records can add useful context. Explore Lincolnshire’s archive and heritage resources for canal plans, toll records, maintenance surveys and photographs. Restoration reports may describe a winding hole that has since dried, moved behind a hedge or become part of a drainage scheme. The Grantham Canal Society guide provides a strong starting point for route history and links the canal’s industrial story with the places visible today.

Begin with one bend at a time. Mark the old canal alignment and the newer straight line on tracing paper or in a note, then identify the point at which they separated or rejoined. The winding hole should lie at or close to that transition. If the two lines do not support the feature on the ground, it is more likely an unrelated hollow.

Read the canal’s former geometry in the landscape

The clearest surviving clue is often the shape of the land. Look for a straight ditch-like section crossing the neck of a larger curve, with the old towpath or hedge line continuing around the outside. A ridge of former excavated material may divide the two routes. In some places the abandoned section has become a rough pasture depression, while elsewhere it survives as a narrow drainage channel.

Other details include unusually broad towpath edges, gaps in a hedge, old mooring rings and drainage channels that lead towards the present canal. A public footpath may still follow the abandoned curve even when the watercourse has disappeared. Straight crop lines are not proof, but changes in soil colour, rushes, wet hollows and ridge-and-furrow patterns can reveal the buried geometry.

Useful reference points include the Trent-side approaches to Hough-on-the-Hill, the corridor near Skillington and Woolsthorpe-by-Belvoir, and the older approaches to Grantham. A village name does not by itself identify a winding hole, so use those places to orient the search rather than assuming a feature lies beside every settlement. The historic map should always determine the final position.

Keep the ground rules straightforward. Some winding holes sit in working fields, private gardens or areas without public access. View them from rights of way, use public footpaths and bridleways, and do not climb fences or enter fields without permission. Banks may be soft, steep or undercut, and mature trees can conceal deep water. Keep children and dogs well back from unstable edges.

Build a reliable digital record

A modern interactive map helps separate the route from the wider road and river network. The society’s interactive canal map is useful as a base layer for checking access points, bridges and the alignment of the canal through each village. Pin the suspected winding hole only after confirming its position against historic mapping; a modern map may label it simply as a pond, dyke or field drain.

Satellite imagery can then reveal patterns invisible at street-map scale. Look for the ghost of an older channel, a straight crop boundary crossing a curve, or a vegetation line that does not follow the present waterway. Historical aerial photographs are especially valuable where ground use has changed since the canal’s working years. Comparing images from different decades can show a hollow being drained, grazed, ploughed or planted.

Record the finding in a form that another visitor can use. Give the feature a local name if one exists, note the nearest bridge or farm, include a grid reference and describe the safest public viewpoint. What3words, familiar to many Australians, can identify a precise spot, but an OS grid reference is still worth retaining because one small square can contain several hollows and field entrances.

Plan access and supporting stops

Public transport works best around the larger settlements. Grantham has a railway station and local bus connections, while village services along the route are less frequent and may require a walk to the stop. Australians accustomed to tapping an Opal card in Sydney or a Myki in Melbourne should not assume the same system applies. Local operators often sell separate tickets, and contactless payment is not guaranteed on every rural service.

For drivers, Britain uses the left like Australia, although vehicles have the steering wheel on the right. Parking is usually easier in villages than at isolated canal features, so combine a short walk with several nearby candidates. The word pub also has a different everyday meaning: in many parts of Australia it denotes a hotel, while along this English canal it normally means a traditional bar or tavern serving drinks and simple meals.

The local visitor market is a mixture of volunteer organisations, independent businesses, boat-hire providers and village pubs rather than one large concession. For visitors combining the waterway with a wider holiday, a general collection of short break ideas can provide comparative inspiration, although historic canal identification should always rely on specialist and archival sources.

Match the search to the season

British winter falls during Australian summer, while English summer corresponds to the Australian winter. Winter can bring higher water, muddy towpaths and saturated fields, but the low vegetation may expose ridges and drainage lines. Summer usually gives drier, firmer ground and clearer views of the wider landscape, although brambles and crops can conceal features.

Spring brings nesting birds and flowering canal-side vegetation, so approach hollows quietly and avoid disturbing livestock. Autumn leaves often highlight old boundaries but can hide changes in level. After heavy rain, apparently minor depressions may become obvious as drainage water collects, yet the same conditions make banks slippery and temporary tracks unreliable. Wear boots with grip rather than relying on ordinary shoes.

Boaters need a separate form of research. The Grantham Canal is not yet fully navigable along its historic length, and many winding holes lie beyond the currently restored waterway. Restoration sections can still reveal how vessels negotiated the route, but do not treat a mapped winding hole as an accessible berth without checking current navigation notices, water levels and landing rights.

Keep the working canal in view

The canal opened in 1797 to carry coal and other goods, with commercial traffic continuing until 1954. Its winding holes belonged to a system concerned with gradients, loading, boat handling and efficient routes through uneven terrain. Recognising that purpose changes the experience: a seemingly insignificant hollow becomes evidence of a practical solution devised more than two centuries ago.

The most reliable method is to move between documents and ground. Use old maps to predict the geometry, modern mapping to reach the location and local records to explain why the feature exists. Record enough detail for the next visitor, respect the working landscape and retain the distinction between a confirmed historic feature and a possible survivor.

The Grantham Canal’s winding holes are not random ponds. They are the surviving signature of engineers cutting across a contour, and once the old and new routes are read together, the waterway’s history becomes visible in the land itself.