| North Fork Trinity River | |
| River | |
| Country | United States |
|---|---|
| State | California |
| Tributaries | |
| - left | Grizzly Creek, East Fork North Fork Trinity River |
| City | Helena |
| Source | Rays Peak |
| - location | Trinity National Forest |
| - elevation | 5,700 ft (1,737 m) |
| - coordinates | |
| Mouth | Trinity River |
| - location | Helena |
| - elevation | 1,358 ft (414 m) |
| - coordinates | |
| Length | 25 mi (40 km) |
| Basin | 151 sq mi (391 km2) |
| Discharge | for Helena, CA |
| - average | 431 cu ft/s (12 m3/s) |
| - max | 35,800 cu ft/s (1,014 m3/s) |
| - min | 7.5 cu ft/s (0 m3/s) |
The North Fork Trinity River is a tributary of the Trinity River in the U.S. state of California. It flows south through the Klamath Mountains for about 25 miles (40 km), emptying into the Trinity at Helena, about 5 miles (8.0 km) northeast of Junction City. The river drains an area of 151 square miles (390 km2). Important tributaries include the East Fork North Fork Trinity River and Grizzly Creek.