Sandy River -
The Sandy River is a 56-mile (90 km) tributary of the Columbia River in northwestern Oregon in the United States. Measured by a United States Geological Survey (USGS) gauge downstream of the Sandy's confluence with the Bull Run River, 18.4 miles (29.6 km) from the mouth, the river's average discharge is 2,300 cubic feet per second (65 m3/s). The maximum daily recorded flow is 84,400 cubic feet per second (2,390 m3/s), and the minimum is 45 cubic feet per second (1.3 m3/s). The Sandy joins the Columbia about 14 miles (23 km) upstream of Portland.
Issuing from Reid Glacier on the southwest flanks of Mount Hood in the Cascade Range, the Sandy River flows generally west and then north for 56 miles (90 km) through Clackamas County and Multnomah County to the Columbia River at Troutdale. In its first 12 miles (19 km), the Sandy River flows across Old Maid Flat, north of Zigzag Mountain in the Mount Hood Wilderness of the Mount Hood National Forest. In this initial stretch near the headwaters, it receives Rushing Water Creek from the left, Muddy Fork from the right, then Lost Creek and Horseshoe Creek from the left, and crosses under Lolo Pass Road just before receiving Clear Creek from the right. At about 41 miles (66 km) from the mouth, the Zigzag River enters from the left near the unincorporated community of Zigzag. From here the river runs roughly parallel to U.S. Route 26, which is on its left for about the next 20 miles (32 km). Just below Zigzag, the Sandy River passes the unincorporated community of Wemme on the left.
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