| Cedar Falls | |
| Other Name: | Moncton |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | USA Washington |
| Pushpin Map Caption: | Location within the state of Washington |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Washington |
| Subdivision Type2: | County |
| Subdivision Name2: | King |
| Unit Pref: | Imperial |
| Population As Of: | 2010 |
| Population Density Km2: | auto |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Elevation Ft: | 942 |
| Coordinates: | 47.4253°N -121.7767°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 98022 |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1517561[1] |
Cedar Falls is an unincorporated community in King County, Washington.
Located on the Rattlesnake Prairie and the Cedar River watershed, Cedar Falls began under the name, Moncton, in 1906 under expansion of the transcontinental line of the Chicago, Milwaukee and St. Paul Railroad (CMStP&P) through Snoqualmie Pass. The community became a construction camp for the Seattle Municipal Light and Power Plant and as a joint-company town of Seattle City Light, the Seattle Water Department, and the CMStP&P. Each company provided separate housing and amenities for its employees and their families.[2] Due to its location to Cedar Lake, the town became known as Cedar Falls and by 1909 was host to a grocery, hotel, and schoolhouse.
Seattle City Light began operations in the community to provide power to Seattle with the build of a dam outside the town in 1912 on the Cedar River. The power company received warnings about the porous glacial geology in the area but continued the construction. After the water retention structure was completed in early 1915, immediate flooding due to seepage began to occur. Almost the entirety of the population left their homes within months due to the rising water levels. Officials denied the dam was the cause of the flooding but after several months, Cedar Falls was condemned and compensation was provided to residents.[3]