Mill Creek (Walla Walla River tributary)
| Mill Creek | |
|---|---|
The flood diversion dam on Mill Creek upstream of Walla Walla | |
Location of the mouth of Mill Creek in Washington | |
| Physical characteristics | |
| Source | Blue Mountains |
| • location | Columbia County, Washington |
| • coordinates | 45°59′58″N 117°55′42″W / 45.99944°N 117.92833°W |
| • elevation | 4,800 ft (1,500 m) |
| Mouth | Walla Walla River |
• location | Walla Walla County, Washington |
• coordinates | 46°02′19″N 118°28′43″W / 46.03861°N 118.47861°W |
• elevation | 594 ft (181 m) |
| Length | 36.5 mi (58.7 km) |
| Basin size | 113.7 mi2 (294 km2) |
| Discharge | |
| • location | About 1.5 mi (2.4 km) upstream from Walla Walla |
| • average | 79.9 cu ft/s (2.26 m3/s) |
| • minimum | 0 cu ft/s (0 m3/s) |
| • maximum | 3,070 cu ft/s (87 m3/s) |
Mill Creek is a 36.5-mile-long (58.7 km) tributary of the Walla Walla River, flowing through southeast Washington and northeast Oregon in the United States. It drains from the western side of the Blue Mountains into the Walla Walla Valley and flows through the city of Walla Walla, which draws most of its water supply from the creek. The creek is named for the sawmill built in 1845 by Marcus Whitman, one of the first European settlers in the valley.