Course
Fanno Creek arises at an elevation of 478 feet (146 m) above sea level and falls 370 feet (110 m) between source and mouth to an elevation of 108 feet (33 m). The main stem begins at about river mile (RM) 15 or river kilometer (RK) 24 in the Hillsdale neighborhood of southwest Portland, in Multnomah County. The creek flows west along the north side of Oregon Route 10 (the Beaverton–Hillsdale Highway), passing Albert Kelly Park and receiving Ivey Creek and Bridlemile Creek on the right before reaching the United States Geological Survey (USGS) stream gauge at Southwest 56th Avenue 11.9 miles (19.2 km) from the mouth. Shortly thereafter and in quick succession, it enters Washington County and the unincorporated community of Raleigh Hills, crosses under Route 10, and receives Sylvan Creek on the right. Here the stream turns south, passing through Bauman Park, where Vermont Creek enters on the left about 10 miles (16 km) from the mouth, and then southwest to flow through the Portland Golf Club and Vista Brook Park, where Woods Creek enters on the left. From here it flows west again for about 1 mile (1.6 km), passing through Fanno Creek Trail Park and entering Beaverton about 8 miles (13 km) from the mouth before turning sharply south and flowing under Oregon Route 217 (Beaverton–Tigard Highway).
Fanno Creek then flows roughly parallel to Route 217 for about 2 miles (3 km) through Fanno Creek Park and Greenway Park. Near the southern end of Greenway Park, the creek passes under Oregon Route 210 (Scholls Ferry Road), and enters Tigard about 5 miles (8 km) from the mouth. In quick succession, Hiteon Creek enters on the right, Ash Creek on the left, and Summer Creek on the right before the creek reaches Woodard Park, goes under Oregon Route 99W (Southwest Pacific Highway), and flows through Fanno Park and Bonita Park as well as residential neighborhoods. Between the two parks, Red Rock Creek enters on the left about 2.5 miles (4.0 km) from the mouth. Slightly downstream of Bonita Park, Ball Creek enters on the left. Fanno Creek then enters Durham, passes a USGS gauging station 1.13 miles (1.82 km) from the mouth, flows through Durham City Park, and empties into the Tualatin River 9.3 miles (15.0 km) from its confluence with the Willamette River.
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