In 1999 the Society stumbled upon, among papers donated to the collection, a 1949 construction photograph bearing a handwritten note on the reverse side, referring to a previously unknown inspection gallery portal. The portal was located and cleared. An Interior Condition Survey was conducted on October 9, 1999; the scanned prints are presented below. The portal was permanently sealed in the spring of 2000, awaiting resumption of the dam's construction.

Station 1. (Click for larger view.)

Station 2. (Click for larger view.)

Station 3. (Click for larger view.)

Station 4. (Click for larger view.)

Station 5. (Click for larger view.)

Station 6. (Click for larger view.)

Station 7. (Click for larger view.)

Station 8. (Click for larger view.)

Station 9. (Click for larger view.)

Survey sketch, October 9, 1999. Portions withheld. (Click for larger view.)