Onion Valley Reservoir was constructed in the early 1960s as an irrigation reservoir. The land surrounding the reservoir is managed by the Bureau of Land Management making the entire area accessible to angling.
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- Region
- Western
- County
- Humboldt
- Type of water
- Lake or Reservoir
Fishing Report
Onion has been fishing really well this summer for a few carryover trout and the recently stocked trout. Small spinners and spoons from shore have been great in addition to power bait and crawlers off the bottom.
Onion Valley Reservoir Angler Guide Information
07-10-2025Stocking Updates
| Stocked | Species | Inches | Date Stocked | Year to Date |
|---|---|---|---|---|
| 503 | Tiger Trout | 6.6 | 10-24-2025 | 503 |
| 436 | Rainbow Trout | 8.0 | 10-24-2025 | 1498 |
| 1062 | Rainbow Trout | 8.9 | 10-10-2025 | 1062 |
| 1155 | Rainbow Trout | 9.3 | 06-11-2024 | 1534 |
| 379 | Rainbow Trout | 9.4 | 06-11-2024 | 379 |
Pertinent Information
Onion Valley Reservoir covers 101 acres when full and has a maximum depth of 24 feet. Sport fish include rainbow trout, bowcutt trout (rainbow x cutthroat trout hybrid), and tiger trout (brown x brook trout hybrid). Anglers generally catch trout ranging from 9 to 16 inches. The best times of year to fish are mid-June during the damselfly hatch and from mid-October to the end of the season (November 15). The standard baits include nightcrawlers and Power Bait along with flies (nymph patterns and woolly buggers) fished from float tubes. Camping occurs at primitive sites and a restroom is located at the south end of the lake. Aspen stringers make this area a beautiful place to camp.