Mill Hollow Reservoir fishing
Mill Hollow Reservoir was last stocked on Sept. 14, 2026 with 504 rainbow trout (11.0 in. average), according to the Utah DWR fish stocking report. It is a reservoir in Wasatch County, Utah. From 2021 to 2026, DWR stocked 74,049 fish here, the 8th most of 24 stocked waters in Wasatch County.
Recent stockings at Mill Hollow Reservoir
- Sept. 14, 2026504 rainbow trout, 11.0 in. average
- Sept. 2, 2026506 rainbow trout, 11.1 in. average
- Aug. 17, 2026501 rainbow trout, 12.4 in. average
- Aug. 4, 2026500 rainbow trout, 12.5 in. average
- July 27, 2026688 tiger trout, 3.4 in. average
- July 21, 2026500 rainbow trout, 10.0 in. average
Newest first, from the Utah DWR stocking report. Full stocking history.
Mill Hollow Reservoir facts
- Last stocked
- Sept. 14, 2026 (57 days ago): 504 rainbow trout
- Stockings in 2026
- 15 (12,124 fish): 6,083 rainbow trout, 4,538 tiger trout and 1,503 brook trout
- County
- Wasatch County
- Size
- Approximately 18 acres
- Stocked since 2021
- rainbow trout, tiger trout and brook trout
- Likely catch (DWR)
- rainbow trout and tiger trout
- Average size stocked
- 7.3 in. (2021 to 2026)
- County rank
- 8th most fish of 24 stocked waters in Wasatch County since 2021
- Name in DWR report
- MILL HOLLOW RES
- Nearest water
- Upper South Fork Provo River, 3.4 mi
- Rules
- Statewide rules (no water-specific entry in the 2026 guidebook)
Mill Hollow Reservoir stocking report, last 12 months
| Sept. 14, 2026 | Rainbow trout | 504 | 11.0 in. |
| Sept. 2, 2026 | Rainbow trout | 506 | 11.1 in. |
| Aug. 17, 2026 | Rainbow trout | 501 | 12.4 in. |
| Aug. 4, 2026 | Rainbow trout | 500 | 12.5 in. |
| July 27, 2026 | Tiger trout | 688 | 3.4 in. |
| July 21, 2026 | Rainbow trout | 500 | 10.0 in. |
| July 6, 2026 | Tiger trout | 515 | 3.3 in. |
| July 6, 2026 | Brook trout | 1,503 | 3.0 in. |
| July 6, 2026 | Rainbow trout | 501 | 10.5 in. |
| July 6, 2026 | Tiger trout | 3,335 | 3.4 in. |
| June 23, 2026 | Rainbow trout | 801 | 11.2 in. |
| June 17, 2026 | Rainbow trout | 599 | 11.5 in. |
| June 3, 2026 | Rainbow trout | 800 | 12.0 in. |
| May 13, 2026 | Rainbow trout | 506 | 10.3 in. |
| May 13, 2026 | Rainbow trout | 365 | 11.0 in. |
Source: Utah DWR fish stocking report. Stocking data fetched Nov. 10, 2026; newest record dated Nov. 19, 2026. DWR posts stockings after they happen and does not publish schedules.
Mill Hollow Reservoir stocking profile
- First record in the DWR report: May 20, 2002. Since then DWR has logged 279 stockings here in 23 different years, 422,504 fish in all.
- Species stocked 2021 to 2026, by share of fish: rainbow trout 51% (38,071 fish), tiger trout 38% (28,407 fish) and brook trout 10% (7,571 fish).
- Busiest months in the record: July (36% of records) and June (31% of records).
- Stocked fish averaged 7.3 in. from 2021 to 2026 (per-record averages ranged from 2.5 to 13.6 in.). The yearly average was 7.2 in. in 2021 and 7.8 in. in 2025.
- Fish stocked 2021 to 2026: 74,049, the 8th most of 24 stocked waters in Wasatch County and 82nd of 1,076 statewide.
- Nearest other water with a page: Upper South Fork Provo River, 3.4 mi away.
Computed from Utah DWR stocking records (fish counts and average lengths as DWR reports them). Past stocking is history, not a schedule.
When is Mill Hollow Reservoir stocked?
Based on DWR stocking records, 2021 to 2025. Stocked in 5 of those 5 years.
2025 stocking: 15 records, first on May 15, last on Oct. 8.
DWR does not publish stocking schedules. This is past stocking, not a promise. How we read patterns.
Mill Hollow Reservoir stocking history by year
| Year | Records | Fish | Avg. length | Species |
|---|---|---|---|---|
| 2026 | 15 | 12,124 | 7.3 in. | Rainbow trout, Tiger trout, Brook trout |
| 2025 | 15 | 11,936 | 7.8 in. | Tiger trout, Rainbow trout, Brook trout |
| 2024 | 12 | 13,459 | 7.1 in. | Rainbow trout, Tiger trout, Brook trout |
| 2023 | 11 | 10,782 | 7.4 in. | Rainbow trout, Tiger trout |
| 2022 | 11 | 12,403 | 7.0 in. | Rainbow trout, Brook trout, Tiger trout |
| 2021 | 12 | 13,345 | 7.2 in. | Rainbow trout, Brook trout, Tiger trout |
| 2020 | 11 | 17,419 | 5.7 in. | Rainbow trout, Brook trout, Tiger trout |
| 2019 | 9 | 14,756 | 6.4 in. | Rainbow trout, Tiger trout, Brook trout |
| 2018 | 9 | 17,335 | 6.1 in. | Rainbow trout, Tiger trout, Brook trout |
| 2017 | 8 | 17,291 | 5.6 in. | Rainbow trout, Brook trout, Tiger trout |
| 2016 | 11 | 18,710 | 5.7 in. | Tiger trout, Rainbow trout, Brook trout |
| 2015 | 9 | 15,319 | 6.1 in. | Rainbow trout, Brook trout, Tiger trout |
| 2014 | 6 | 18,671 | 5.2 in. | Rainbow trout, Brook trout, Tiger trout |
| 2013 | 7 | 18,438 | 5.6 in. | Rainbow trout, Brook trout, Tiger trout |
| 2012 | 10 | 19,241 | 6.3 in. | Rainbow trout, Brook trout, Tiger trout |
| 2011 | 8 | 18,957 | 5.4 in. | Rainbow trout, Brook trout, Tiger trout |
| 2010 | 9 | 17,397 | 6.5 in. | Rainbow trout, Tiger trout, Brook trout |
| 2009 | 13 | 28,478 | 6.2 in. | Rainbow trout, Brook trout, Tiger trout |
| 2006 | 6 | 7,735 | 11.3 in. | Rainbow trout |
| 2005 | 21 | 28,202 | 6.6 in. | Rainbow trout, Tiger trout, Brook trout |
| 2004 | 24 | 34,739 | 6.8 in. | Rainbow trout, Tiger trout, Trout (mixed), Brook trout |
| 2003 | 22 | 29,487 | 6.4 in. | Rainbow trout, Tiger trout, Brook trout |
| 2002 | 20 | 26,280 | 6.9 in. | Rainbow trout, Brook trout |
All stocking records 2021 to Nov. 10, 2025 (61)
| Oct. 8, 2025 | Tiger trout | 3,500 | 5.3 in. |
| Sept. 16, 2025 | Rainbow trout | 615 | 11.0 in. |
| Sept. 2, 2025 | Rainbow trout | 499 | 10.8 in. |
| Aug. 18, 2025 | Rainbow trout | 500 | 10.8 in. |
| Aug. 4, 2025 | Rainbow trout | 600 | 11.9 in. |
| Aug. 4, 2025 | Rainbow trout | 501 | 10.5 in. |
| July 22, 2025 | Rainbow trout | 664 | 11.9 in. |
| July 22, 2025 | Rainbow trout | 500 | 10.8 in. |
| July 10, 2025 | Rainbow trout | 375 | 10.3 in. |
| June 25, 2025 | Rainbow trout | 625 | 10.3 in. |
| June 18, 2025 | Brook trout | 1,500 | 3.1 in. |
| June 18, 2025 | Tiger trout | 555 | 3.3 in. |
| June 12, 2025 | Rainbow trout | 501 | 9.7 in. |
| May 29, 2025 | Rainbow trout | 502 | 9.6 in. |
| May 15, 2025 | Rainbow trout | 499 | 9.7 in. |
| Sept. 10, 2024 | Rainbow trout | 500 | 10.7 in. |
| Aug. 21, 2024 | Rainbow trout | 500 | 10.7 in. |
| Aug. 14, 2024 | Tiger trout | 1,520 | 11.5 in. |
| Aug. 5, 2024 | Rainbow trout | 500 | 10.7 in. |
| July 22, 2024 | Rainbow trout | 501 | 10.1 in. |
| July 10, 2024 | Brook trout | 1,530 | 2.9 in. |
| July 10, 2024 | Tiger trout | 4,640 | 2.8 in. |
| July 8, 2024 | Rainbow trout | 500 | 10.1 in. |
| June 24, 2024 | Rainbow trout | 301 | 12.0 in. |
| June 24, 2024 | Rainbow trout | 500 | 10.2 in. |
| June 17, 2024 | Rainbow trout | 1,501 | 10.2 in. |
| June 17, 2024 | Rainbow trout | 966 | 11.7 in. |
| Sept. 18, 2023 | Rainbow trout | 1,002 | 10.3 in. |
| Aug. 22, 2023 | Rainbow trout | 500 | 10.0 in. |
| Aug. 16, 2023 | Rainbow trout | 500 | 10.0 in. |
| July 31, 2023 | Rainbow trout | 500 | 10.5 in. |
| July 18, 2023 | Rainbow trout | 1,000 | 10.0 in. |
| July 18, 2023 | Rainbow trout | 301 | 12.9 in. |
| July 17, 2023 | Tiger trout | 4,510 | 2.8 in. |
| June 30, 2023 | Rainbow trout | 1,001 | 11.2 in. |
| June 30, 2023 | Rainbow trout | 602 | 11.8 in. |
| June 13, 2023 | Rainbow trout | 365 | 11.4 in. |
| June 13, 2023 | Rainbow trout | 501 | 11.1 in. |
| Sept. 19, 2022 | Rainbow trout | 1,000 | 12.7 in. |
| Aug. 24, 2022 | Rainbow trout | 503 | 11.7 in. |
| Aug. 10, 2022 | Rainbow trout | 502 | 9.9 in. |
| July 27, 2022 | Rainbow trout | 504 | 9.9 in. |
| July 13, 2022 | Rainbow trout | 499 | 11.8 in. |
| June 27, 2022 | Rainbow trout | 802 | 11.9 in. |
| June 14, 2022 | Rainbow trout | 631 | 11.8 in. |
| June 13, 2022 | Brook trout | 1,520 | 2.5 in. |
| June 13, 2022 | Tiger trout | 4,608 | 2.7 in. |
| June 8, 2022 | Rainbow trout | 1,169 | 9.4 in. |
| June 8, 2022 | Rainbow trout | 665 | 11.3 in. |
| Aug. 17, 2021 | Rainbow trout | 1,000 | 12.1 in. |
| Aug. 2, 2021 | Rainbow trout | 998 | 10.1 in. |
| July 20, 2021 | Rainbow trout | 1,008 | 10.1 in. |
| July 15, 2021 | Rainbow trout | 1,051 | 9.3 in. |
| July 1, 2021 | Rainbow trout | 720 | 9.6 in. |
| July 1, 2021 | Rainbow trout | 512 | 13.6 in. |
| July 1, 2021 | Brook trout | 1,518 | 2.8 in. |
| July 1, 2021 | Tiger trout | 4,536 | 3.1 in. |
| June 15, 2021 | Rainbow trout | 501 | 9.3 in. |
| June 15, 2021 | Rainbow trout | 501 | 12.5 in. |
| May 24, 2021 | Rainbow trout | 500 | 12.1 in. |
| May 24, 2021 | Rainbow trout | 500 | 9.0 in. |
Fishing rules
No water-specific entry for Mill Hollow Reservoir in the 2026 guidebook: statewide limits apply unless a group entry (such as a drainage) covers it.
From the 2026 Utah Fishing Guidebook, in our own words. Rules can change mid-year: check wildlife.utah.gov/guidebooks before fishing.
Access and facilities
- Facilities
- Trails/shoreline paths
Facility list from DWR Fish Utah. Check with the land manager before you go; facilities close seasonally.
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Mill Hollow Reservoir questions
When is Mill Hollow Reservoir stocked?
DWR does not publish stocking schedules. Past records show Mill Hollow Reservoir was stocked in late May to early June (3 of the last 5 years), mid to late June (5 of the last 5 years), early to mid July (5 of the last 5 years), late July to early August (5 of the last 5 years), mid to late August (5 of the last 5 years) and mid September (3 of the last 5 years). The most recent stocking in the DWR report is dated Sept. 14, 2026.
What fish are in Mill Hollow Reservoir?
DWR lists rainbow trout and tiger trout as likely catches and brook trout as possible. Since 2021 DWR has stocked rainbow trout, tiger trout and brook trout.
Stocking: Utah DWR fish stocking report, fetched Nov. 10, 2026. Size, program, species and facilities: DWR Fish Utah. Location: Utah DWR, USGS NHD. Rules: 2026 Utah Fishing Guidebook. Page built Nov. 10, 2026. Found an error? Tell us. Verify rules with DWR before fishing.