LivewellCalifornia · Mono County · River
Mammoth Creek
Is the fish you caught here safe to eat? Below is every consumption advisory on file for Mammoth Creek, by species and size, in plain English — plus what's legal to keep.
2 species with advisories · contaminants: Mercury
California also has statewide guidance
California publishes rules that apply to rivers across the state — 32 recommendations covering 15 species — in addition to anything listed for Mammoth Creek below.
Strictest statewide rule: Black Bass — For women 18–49 and children 1–17: do not eat due to elevated Mercury.
What's safe to eat from Mammoth Creek
Brown Trout
| Size | Who | Guidance |
|---|---|---|
| All sizes | Women 50 and older and men 18 and older | Limit to two meals per week due to elevated Mercury. |
| Women 18–49 and children 1–17 | For women 18–49 and children 1–17: limit to one meal per week due to elevated Mercury. |
Source: official advisory· updated 2026-11-06
Rainbow Trout
| Size | Who | Guidance |
|---|---|---|
| All sizes | Women 50 and older and men 18 and older | Limit to four meals per week. |
| Women 18–49 and children 1–17 | For women 18–49 and children 1–17: limit to four meals per week. |
Source: official advisory· updated 2026-11-06
Is it legal to keep?
These are California's statewide limits — a water-specific rule may override them. Always verify the current regulations before keeping a fish.
| Species | Size | Daily limit | Open season | Keep season |
|---|---|---|---|---|
| Largemouth Bass | — | 5 | Year-round | Same as open |
| Smallmouth Bass | — | 5 | Year-round | Same as open |
| Striped Bass | 18" min | 2 | Year-round | Same as open |
| Rainbow Trout | — | 5 | Year-round | Same as open |
| Black Crappie | — | 25 | Year-round | Same as open |
| Channel Catfish | — | 10 | Year-round | Same as open |
Official rules: California — California DFW