Some interesting early aerial photographs of the building of the Gorple reservoirs and Hebden Bridge are available on the Britain From Above website.
Taken in 1929, the Gorple pictures show the building of the dams with the navvies’ huts close by. The Pack Horse pub is visible in the distance of one of the 13 pictures. To find the whole set, search for Heptonstall, one is shown below.
The four Hebden Bridge pictures, taken in 1931, show the many mills in the valley bottom with Heptonstall Road leading up above it, the now demolished Cross Stones Methodist Chapel at the top of the buttress is also visible.