Fourmile Creek (Pennsylvania)
| Fourmile Creek | |
 A waterfall on Fourmile Creek in Wintergreen Gorge
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| Name origin: the creek's distance from Erie, Pennsylvania | |
| Country | United States |
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| State | Pennsylvania |
| County | Erie |
| Source | |
| - location | Greene Township, Erie County, Pennsylvania |
| - coordinates | 42°3′55″N 79°56′37″W / 42.06528°N 79.94361°W |
| Mouth | Lake Erie |
| - location | Lawrence Park, Erie County, Pennsylvania |
| - coordinates | 42°9′36″N 80°1′47″W / 42.16000°N 80.02972°WCoordinates: 42°9′36″N 80°1′47″W / 42.16000°N 80.02972°W |
| Length | 8.0 mi (13 km) |
| Basin | 11.93 sq mi (31 km2) |
 Location of the mouth of Fourmile Creek in Pennsylvania
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Fourmile Creek is a tributary of Lake Erie in Erie County, Pennsylvania, United States. It is approximately 8 miles (13 km) in length. It has a drainage basin of 11.93 square miles (30.9 km2) and is a part of the Lake Erie Watershed.
Fourmile Creek starts in Greene Township, immediately north of Pennsylvania Route 8. It flows northwest, with its valley getting deeper as it flows onwards. After several miles, it crosses under Interstate 90 and exits Greene Township, entering Harborcreek Township. At this point, the creek turns northwards and its valley continues to get deeper. After some distance, the valley gets shallower and the creek flows under Pennsylvania Route 290. It turns northwest and heads along the border between Harborcreek Township and Erie, eventually entering Erie. Upon entering Erie, it continues northwest, passing through the Lawrence Park Golf Club and entering Lake Erie.
The pH of Fourmile Creek ranges between 6 and 9. The salinity ranges from 0.1 parts per trillion to 0.3 parts per trillion. The total concentration of dissolved solids ranges from 180 to 500 parts per million. In 1982, the concentration of sodium in the creek ranged from 2.91 to 40.8 milligrams per liter at two sites. In the same year, the concentration of magnesium ranged from 2.9 to 14.2 milligrams per liter at two sites. The calcium concentration ranged from 29.3 to 134.5 milligrams per liter at two sites. The concentration of phosphates ranged from 0 to 0.55 milligrams per liter at two sites.
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