| Davidson Ditch | |
|---|---|
 An inverted siphon of Davidson Ditch, seen in 2008. | |
| Location | |
| Country | Alaska, USA |
| Coordinates | 65°13′35″N 146°57′9″W / 65.22639°N 146.95250°W |
| General direction | Northeast-Southwest |
| From | Chatanika River |
| To | Goldstream Creek area |
| Runs alongside | Steese Highway |
| General information | |
| Type | water |
| Commissioned | 1928 |
| Technical information | |
| Length | 90 mi (140 km) |
| Maximum discharge | 180,000 US gallons (680 m3) per day |
Davidson Ditch is a 90-mile (140 km) conduit built in the 1920s to supply water to gold mining dredges in central Alaska. It was the first large-scale pipeline construction project in Alaska, and lessons learned in its construction were applied to the building of the Trans-Alaska Pipeline System. It is eligible for inclusion on the National Register of Historic Places, but has not been listed due to a lack of information. Despite this, the remains of the conduit are partially protected by its inclusion in the White Mountains National Recreation Area.