Lake Merwin trout stocking
Cowlitz County, Washington · lake
Lake Merwin was last stocked 6 weeks ago (Oct 1, 2026). We have 38 stockings on record since Jan 3, 2017, 3 in the last 12 months (55,821 fish). Most stockings come in March, June to July and October. Species stocked: kokanee, rainbow trout.
Last stocked
6 weeks ago
Oct 1, 2026
Next planned
Not announced
Last 12 months
3 stockings
55,821 fish
On record
38 stockings
since Jan 3, 2017
- Number 4 of 7 stocked waters in Cowlitz County by stocking days.
- Stocked more often than 90% of Washington waters on our record.
When is Lake Merwin stocked?
Most stockings come in March, June to July and October. Stocked 3 times in 2026, usually on Mondays, about every 140 days.
By month, all years
Year by year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 1 | 1 | |||||||||
| 2025 | 1 | 1 | 1 | |||||||||
| 2024 | 1 | 1 | 1 | |||||||||
| 2023 | 1 | 1 | ||||||||||
| 2022 | 1 | 1 | 1 | 1 | ||||||||
| 2021 | 1 | 1 | 1 | 1 | ||||||||
| 2020 | 1 | 2 | 1 | 1 | ||||||||
| 2019 | 1 | 1 | 1 | 1 |
What is stocked
| Species | Stockings | Fish | Fish per stocking |
|---|---|---|---|
| Kokanee | 24 | 958,780 | 39,949 |
| Rainbow trout | 15 | 41,054 | 2,737 |
Stocking history
20263 stockings · 55,821 fish
| Date | Species | Fish | Since previous | Hatchery |
|---|---|---|---|---|
Oct 1Latest Thursday · 6 weeks ago | Kokanee | 45,000 5,625 lb | 80 days | Speelyai Hatchery |
Jul 13 Monday | Rainbow trout | 5,111 10,438 lb | 20 weeks | Merwin Hatchery |
Feb 23 Monday | Kokanee | 5,710 2,360 lb | 145 days | Speelyai Hatchery |
20253 stockings · 91,235 fish
| Date | Species | Fish | Since previous | Hatchery |
|---|---|---|---|---|
Oct 1 Wednesday | Kokanee | 35,570 3,148 lb | 79 days | Speelyai Hatchery |
Jul 14 Monday | Rainbow trout | 4,965 10,077 lb | 135 days | Merwin Hatchery |
Mar 1 Saturday | Kokanee | 50,700 7,848 lb | 145 days | Speelyai Hatchery |
20243 stockings · 102,037 fish
| Date | Species | Fish | Since previous | Hatchery |
|---|---|---|---|---|
Oct 7 Monday | Kokanee | 45,750 5,627 lb | 12 weeks | Speelyai Hatchery |
Jul 15 Monday | Rainbow trout | 3,437 10,457 lb | 136 days | Merwin Hatchery |
Mar 1 Friday | Kokanee | 52,850 8,622 lb | 148 days | Speelyai Hatchery |
20232 stockings · 43,633 fish
- Oct 5 kokanee, 40,500 fish
- Jul 10 rainbow trout, 3,133 fish
20224 stockings · 140,593 fish
- Oct 9 kokanee, 22,380 fish
- Aug 29 kokanee, 49,540 fish
- Jul 13 kokanee, rainbow trout, 25,993 fish
- Jan 31 kokanee, 42,680 fish
20214 stockings · 86,881 fish
- Oct 29 kokanee, 48,580 fish
- Jun 8 rainbow trout, 1,224 fish
- Apr 19 rainbow trout, 4,207 fish
- Mar 1 kokanee, 32,870 fish
20205 stockings · 110,417 fish
- Dec 18 kokanee, 15,580 fish
- Sep 9 kokanee, 46,010 fish
- Jun 22 rainbow trout, 1,065 fish
- Jun 17 rainbow trout, 1,032 fish
- Mar 1 kokanee, 46,730 fish
20194 stockings · 101,008 fish
- Week of Oct 28 kokanee, 45,800 fish
- Jul 15 rainbow trout, 2,558 fish
- Jun 7 rainbow trout, 1,510 fish
- Mar 1 kokanee, 51,140 fish
20185 stockings · 169,468 fish
- Oct 15 kokanee, 46,495 fish
- Jul 16 rainbow trout, 3,498 fish
- Jun 8 rainbow trout, 1,990 fish
- Jun 1 kokanee, 73,230 fish
- Mar 20 kokanee, 44,255 fish
20175 stockings · 98,741 fish
- Oct 30 kokanee, 40,920 fish
- Jul 10 rainbow trout, 2,681 fish
- Jun 9 rainbow trout, 1,510 fish
- Mar 14 kokanee, 33,490 fish
- Jan 3 kokanee, 20,140 fish
From Washington fish and wildlife agency reports, collected nightly and kept after the agency takes them down. Agencies revise reports; check the agency's report before you go. Seasons and limits: Washington fishing regulations.
Other stocked waters in Cowlitz County
- Merrill Lakelakestocked Oct 28, 2026
- Horseshoe Lakelakestocked May 15, 2026
- Kress Lakelakestocked May 6, 2026
- Lake Sacajawealakestocked May 6, 2026
- Cowlitz Riverstreamstocked Apr 15, 2026
- Silver Lakelakestocked Jan 2, 2026
All stocked waters in Cowlitz CountyStocked this week in Washington
Questions about Lake Merwin
- When was Lake Merwin last stocked?
- The latest reported stocking was Oct 1, 2026 (kokanee, 45,000 fish), according to Washington agency reports.
- How often is Lake Merwin stocked?
- Stocked 3 times in 2026, usually on Mondays, about every 140 days. Across all years on record, most stockings come in March, June to July and October.
- Is Lake Merwin stocked often?
- Number 4 of 7 stocked waters in Cowlitz County by stocking days. Stocked more often than 90% of Washington waters on our record. We count each day the agency reported stocking it.
- What kind of trout are stocked in Lake Merwin?
- Kokanee (24 stockings, 958,780 fish); Rainbow trout (15 stockings, 41,054 fish).