The San Diego Section covers San Diego and Imperial Counties, with Imperial County as its only Branch. The Section has two National Historic Civil Engineering Landmarks, Sweetwater Dam and the All-American Canal, which is located in the Imperial County Branch.
Links to these National landmarks and to the Local landmarks of the Section can be accessed below.
| (N) – National (L) – Local | |
|---|---|
| All-American Canal (N) | Georgia Street Bridge (L) |
| Balboa Park and Cabrillo Bridge (L) | North Park Water Tower (L) |
| Carrizo Gorge (Goat Canyon) Trestle (L) |
San Diego and Arizona Railway (L) |
| Escondido Canal (L) | San Diego Electric Railway (L) |
| First San Diego Aqueduct (L) | San Diego Flume (L) |
| Fleet Hangar Building 340, North Island Naval Air Station (L) |
Spruce Street Suspension Bridge (L) |
| Old Mission Dam (L) | Sweetwater Dam (N) |
| Palomar Observatory |