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Black Jack's Mill – Cassiobury Park Bridge No. 157 loop from Watford Junction

Routes

Bike touring routes & trails

Black Jack's Mill – Cassiobury Park Bridge No. 157 loop from Watford Junction

Moderate

5.0

(6)

riders

Black Jack's Mill – Cassiobury Park Bridge No. 157 loop from Watford Junction

02:37

34.2km

100m

Cycling

Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: May 17, 2026

Tips

Cycling is not permitted along parts of this route

After 0 m for 232 m

After 34.0 km for 232 m

Waypoints

Start point

Train Station

Get Directions

6.87 km

Broadacres Lake

Lake

9.33 km

Stocker's Lock and Stone Bridge

Highlight • Structure

About 1922, the land between the River Colne and the canal was taken over by Rickmansworth Gravel Company. Building in the capital was booming and gravel was in demand. Extraction at the site began and the resulting pit became Stocker's Lake. The original Wembley stadium was built at around this time and many have since speculated on the possibility of a Wembley Connection?

Dredging and gravel extraction continued until the 1940s. In 1947 Rickmansworth and Uxbridge Valley Water Company purchased Stocker's Lake (an area of 93.7 acres) for £5000 as the dredging agreement had expired. This was to protect the aquifer and pumping sources at Stocker's and Springwell. The company became Rickmansworth Water Company in 1985 and later part of Three Valleys Water Company, eventually Affinity Water, the present owners.

In the 1970s Stocker’s Lake became a nature reserve and day to day management was assigned by the water company to Herts and Middlesex Wildlife Trust.

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11.2 km

Springwell Lake Towpath Bridge No. 176A

Highlight • Cycleway

12.9 km

Weir at Towpath Bridge No. 177B

Highlight • River

Great looking weir, good to see something different 👍

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17.1 km

Grand Union Canal & Pine Valley Trail Junction

Highlight • Trail

The Grand Union Canal is a cyclist's dream. Running from London to Birmingham, it's always there to help out if you get lost or need a flat route going north and south. Great light gravel path with beautiful and ever changing views.

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