River levels Longridge Canoe Club Longridge Canoe Club, a racing club based on the River Thames in Marlow. New members welcome. More posts by Longridge Canoe Club. Longridge Canoe Club 11 Nov 2019 • 1 min read The amazing resource that is Gaugemap. Shown here the level below Marlow Lock and here the flow at Maidenhead Bridge. Subscribe to Get the latest posts delivered right to your inbox Subscribe Great! Check your inbox and click the link to confirm your subscription. Please enter a valid email address!