The Watermill Bridge is occasionally seen in parts of the series but is not a major location in any episodes apart from Three Steam Engines Gruff in which it is the main location of the episode. Thomas, Percy and Toby all believed that there was a troll underneath the bridge due to some noises being heard, but it was a cow that escaped a field so then she got rescued by Trevor and was returned back to the field.
- A scene of the watermill from the third season episode, Percy's Promise, was used in the opening credits for the sixth season.
- The watermill has appeared in the opening credits for the New Series and the CGI Series.
- In Thomas and the Magic Railroad, the guard rails and arch disappear and the arch is covered by various shrubbery instead. The building also gains an additional window.
- The number of tracks inconsistently changes between 1 and 2.