| Alder Creek | |
| Name Other: | Tributary to South Fork Merced River |
| Map Size: | 300 |
| Pushpin Map: | USA California#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Alder Creek mouth |
| Pushpin Map Alt: | Map of Alder Creek mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | California |
| Subdivision Type3: | County |
| Subdivision Name3: | Mariposa |
| Length: | 6.5miles[1] |
| Discharge1 Location: | South Fork Merced River |
| Discharge1 Avg: | 20.37cuft/s at mouth with South Fork Merced River[2] |
| Source1: | Bridleveil Creek divide |
| Source1 Location: | about 3 miles southeast of Badger Pass Ski Area |
| Source1 Coordinates: | 37.6411°N -119.6294°W[3] |
| Source1 Elevation: | 7520feet[4] |
| Mouth: | South Fork Merced River |
| Mouth Location: | about 6 miles northwest of Winona, California |
| Mouth Coordinates: | 37.5769°N -119.6986°W |
| Mouth Elevation: | 3457feet[5] |
| Progression: | South Fork Merced River → Merced River → San Joaquin River → Suisun Bay → San Francisco Bay → Pacific Ocean |
| River System: | Merced River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | Wawona Road |
Alder Creek is a stream in Mariposa County, California, in the United States. It is a tributary of the South Fork Merced River.
Alder Creek was likely named after Alnus rhombifolia, also known as alder.[6]
Alder Creek rises about 3 miles southeast of Badger Pass Ski Area in Mariposa County, California, and then flows southwest to join South Fork Merced River about 6 miles northwest of Wawona.[5]
Alder Creek drains of area, receives about 45.6 in/year of precipitation, has a wetness index of 308.92, and is about 92% forested.[2]