Aeroplane map showing the section of Trestle Glen to be placed on sale today. Oakland Tribune - 22 May 1921, Sun - Page 14

Sun, May 22, 1921 – Page 14 · Oakland Tribune (Oakland, California) · Newspapers.com

Aeroplane map showing the section of Trestle Glen to be placed on sale today.
The power house of the Western Power Company [Not positive that link correlates. - MF] may be seen in the picture. The white roadway crossing the Glen from the power house is where the old trestle was located that gave the Glen its name. This is a section of the Oakland aeroplane map that is being made by Major Reed Chambers and Captain Eddie Rickenbacher of the Durant Aircraft Association, and for which the Oakland Tribune holds the publication rights. 

Here is that map, georeferenced on a modern map. I think it's warped because it was not shot  perfectly vertically, and the ground is not flat.

Here is that map, paired with 1912 Realty Union "Map Of Oakland And Vicinity", showing the trestle.