Russian River Hydrologic Report June 25, 2021 - July 1, 2021

State Water Resources Control Board Temporary Urgency Change Order (6/14/2021) Russian River Hydrologic Report June 25, 2021 - July 1, 2021

Prepared as a requirement of the Order approving Sonoma Water's Petition for Temporary Urgency Change in Permits 12947A, 12949, 12950, and 16596 (Applications 12919A, 15736, 15737, and 19351).

Instream Flow Requirements as of July 1, 2021 Basis Reach Instantaneous (cfs) 5-day Average (cfs) Modified Per Order: Critical Condition Upper Russian River 15 25 D-1610: Dry Condition Dry Creek 25 - Modified Per Order: Critical Condition Lower Russian River 25 35

Upper Russian River and Lower Russian River based on criteria as established in the Order issued 6/14/2021.

Lake Mendocino

Lake Mendocino Storage 2015 - 2021 and Storage Curve

120,000

100,000

80,000 feet

- 60,000 Acre

40,000

July 01, 2021 30,586 Acre-feet 20,000

2015 2016 2017 2018 2019 2020 2021 Storage Curve Major Deviation Curve Emergency Regulation Storage Threshold

3/1 4/1 5/1 6/1 7/1 8/1 9/1 1/1 2/1

10/1 12/1 11/1

Storage July 1, 2021 30,586 (acre-feet)

Total Average Daily Rate Change in Storage Last 30 days -4,337 -145 (acre-feet) Last 7 days -1,112 -159

Min 7 Daily Inflow Last 7 days Max 24 (cfs) Mean 15

Min 82 Release (cfs) Last 7 days Max 84 Mean 83

Release Flow Change Ramping Rates : Approved Adjusted Rates Event

Requested: 3/1/2021 Purpose: California Department of Fish and Wildlife (CDFW) and National Marine Fisheries Service (NMFS) has requested the discharge from Coyote Valley Dam be increased from 25 cfs to 100 cfs to facilitate the second and final release of steelhead smolts from the Coyote Valley Fish Facility. The increase in discharge is necessary to volitionally push the smolts out into the river to reduce the risk of predation.

Consultation: Staff from Sonoma Water, CDFW and NMFS met on February 26th to discuss the smolt release and associated ramping schedule in light of the very low storage levels in Lake Mendocino. Based on that discussion, Sonoma Water, CDFW and NMFS agreed on the ramping schedule shown below starting on or around March 13th. On March 4th, CDFQ requested the flow changes to occur as soon as possible due to the Coyote Valley Fish Facility experiencing operation challenges. Fow increases will occur incrementally following a ramping rate of 25 cfs per hour. Flow decreases will follow a ramping rate of 25 cfs every eight hours.

Date Time ∆ cfs New Set Point (cfs) 7-Mar 9:00 AM +25 50 7-Mar 10:00 AM +25 75 7-Mar 11:00 AM +25 100 9-Mar 12:00 PM -25 75 9-Mar 8:00 PM -25 50 10-Mar 4:00 AM -25 25

Page 1 Lake Sonoma

Nathan Baskett, March 3, 2021

Lake Sonoma Storage 2015-2021 350,000

300,000

250,000

200,000

feet

- Acre 150,000

July 01, 2021 129,812 Acre-feet 100,000

50,000

2015 2016 2017 2018 2019 2020 2021

1/1 3/1 4/1 5/1 6/1 7/1 8/1 2/1 9/1

10/1 11/1 12/1

Storage July 1, 2021 129,812 (acre-feet)

Total Average Daily Rate Change in Storage Last 30 days -9,484 -316 (acre-feet) Last 7 days -1,781 -254

Min 0 Daily Inflow Last 7 days Max 0 (cfs) Mean 0

Min 101 Release (cfs) Last 7 days Max 107 Mean 105

Page 2 Potter Valley Project

PVP Diversion July 1, 2021 30 (cfs)

Lake Pillsbury

Parameter Date Range Cumulative Daily Average

October 1, 2020 - July 1, 2021 87,593 321 Inflow* (acre-feet) Last 7 days 200 29 *Inflow calculation based on criteria established in D1610

Lake Pillsbury Storage 2015-2021 and Target Storage Scenarios

90,000

80,000

70,000

60,000

50,000

feet

- Acre 40,000

30,000 July 01, 2021 32,653 Acre-feet (Target C 78,353)

20,000

10,000

2015 2016 2017 2018 2019 2020 2021 Target A Target B Target C

1/1 1/8 3/4 4/1 4/8 5/6 6/3 7/1 7/8 8/5 9/9 2/5 9/2

1/15 1/22 1/29 2/12 2/19 2/26 3/18 3/25 4/22 4/29 5/13 5/27 6/10 6/17 7/15 7/22 8/12 8/19 8/26 9/16 9/23 9/30 11/4 12/2 12/9 3/11 4/15 5/20 6/24 7/29 10/7

10/14 10/21 10/28 11/11 11/18 11/25 12/16 12/23 12/30

Page 3 Russian River Flows (June 25 - July 1, 2021)

24-hr Average Flow (cfs) Gage Jun 25, 2021 Jun 26, 2021 Jun 27, 2021 Jun 28, 2021 Jun 29, 2021 Jun 30, 2021 Jul 1, 2021

The Forks* 84 84 84 84 84 84 82

Talmage 70 70 70 69 70 70 67 USGS 11462080 Hopland 64 66 68 67 63 61 59 USGS 11462500 Cloverdale 62 63 64 66 64 62 61 USGS 11463000 Healdsburg 30 30 30 33 32 31 31 USGS 11464000 Hacienda 46 47 48 59 64 54 50 USGS 11467000 *West Fork (USGS 11461000) + East Fork (Coyote Valley Dam Release)

Russian River Flows Increased flows at Hacienda due to lowering Rubber Dam height. 90

70 Hacienda

60 Healdsburg

Cloverdale 50

Hopland

Flow (cfs) Flow 40

Talmage 30

The Forks 20

0 6/26/2021 6/27/2021 6/28/2021 6/29/2021 6/30/2021 7/1/2021

Page 4 Lake Mendocino Water Quality Vertical Profiles (June 25 - July 1, 2021)

LM Dam - Vertical Temperature Profile - 2021 Temperature (°C) 6 8 10 12 14 16 18 20 22 24 26 28 30 0

20 3/4/2021 4/7/2021 30 4/22/2021 5/6/2021 5/20/2021 40 6/3/2021 Depth (ft) Depth 6/17/2021 50 7/1/2021

LM Dam - Vertical DO Profile - 2021 Dissolved Oxygen (mg/L) 0 2 4 6 8 10 12 14 0

20 3/4/2021 4/7/2021 30 4/22/2021 5/6/2021 5/20/2021 40 6/3/2021 Depth (ft) Depth 6/17/2021 50 7/1/2021

LM Dam - Vertical Turbidity Profile 2020 - 2021 Turbidity (NTU) 0 5 10 15 20 25 30 35 40 45 50 0

20 3/4/2021 4/7/2021 30 4/22/2021 5/6/2021 5/20/2021 40 6/3/2021 Depth(ft) 6/17/2021 50 7/1/2021

Page 5 Russian River Water Quality (June 25 - July 1, 2021) Provisional Data Subject to Revision

East Fork Below River Diversion Calpella Hopland Cloverdale* Jimtown* Diggers Bend Hacienda Bridge Johnsons Beach* Parameter Lake Mendocino System at Mirabel*

SCWA USGS 11461500 USGS 11462500 USGS 11463200 USGS 11463682 USGS 11463980 SCWA USGS 11467000 SCWA Min #N/A 66.9 61.3 67.6 65.7 70.9 #N/A 70.7 #N/A Temperature 77.5 70.5 78.1 75.9 81.9 #N/A 76.5 #N/A (°F) Max Mean 72.9 66.3 72.4 70.4 75.9 #N/A 73.9 #N/A Specific Min 277 260 #N/A 344 349 #N/A 229 #N/A Conductivity Max 294 267 #N/A 353 356 #N/A 238 #N/A (µS/cm) Mean 284 265 #N/A 348 353 #N/A 234 #N/A Dissolved Min 6.4 6.9 7.0 4.7 5.3 #N/A 7.5 #N/A Oxygen Max 9.4 11.9 9.8 10.2 11.1 #N/A 10.4 #N/A (mg/L) Mean 7.5 9.0 8.2 7.1 7.9 #N/A 8.4 #N/A Dissolved Min 69 70 75 50 59 #N/A 84 #N/A Oxygen Max 114 133 119 121 139 #N/A 124 #N/A (% Saturation) Mean 85 97 93 80 93 #N/A 98 #N/A Min 7.8 7.6 #N/A 7.2 7.8 #N/A 7.4 #N/A pH Max 8.4 8.7 #N/A 7.5 8.5 #N/A 8.1 #N/A Mean 8.1 8.1 #N/A 7.3 8.1 #N/A 7.6 #N/A Min 1.2 1.6 #N/A 0.2 0.3 #N/A 0.8 #N/A Turbidity 42.7 20.0 #N/A 1.2 2.2 #N/A 2.5 #N/A (NTU) Max Mean 2.2 2.6 #N/A 0.6 1.0 #N/A 1.5 #N/A *Station operated seasonally

Water Quality Mean Values River Diversion System Calpella Hopland Cloverdale* Jimtown* Diggers Bend at Mirabel* Hacienda Bridge Johnsons Beach* 380 10.0 360 340 9.0 320 300 8.0 280 260 7.0

240 Turbidity Temperature 6.0 220 200 5.0 180 160 4.0 140

120 3.0

100 pH, Oxygen, Dissolved Specific Conductivity, SpecificConductivity, 80 2.0 60 40 1.0 20 0 0.0 Specific Conductivity (µS/cm) Temperature (°F) Dissolved Oxygen (mg/L) pH Turbidity (NTU)

Russian River Water Quality (March 1 - July 1, 2021) Provisional Data Subject to Revision

Calpella (East Fork Russian River)

Calpella Water Quality Trend 13.5 28

12.5 24

11.5 20

C) ° 10.5 16

9.5 12

8.5 8

Termperature ( Termperature DO DO (mg/L)and pH

7.5 4

6.5 0

3/1 3/5 4/6 5/4 5/8 6/1 6/9 3/9 4/2 6/5

3/13 3/17 3/25 3/29 4/10 4/18 4/22 4/30 5/16 5/20 5/28 6/13 6/21 6/25 3/21 4/14 4/26 5/12 5/24 6/17 6/29 DO pH Temperature

Calpella- Difference between Daily Maximum and Minimum for DO and pH 300 4.0

3.5 250 3.0 200 2.5

150 2.0

Flow (cfs) Flow 1.5 100 1.0 50 0.5

0 0.0 (mg/L) in DO pH and Difference

3/1 3/9 4/6 5/4 5/8 6/1 6/5 3/5 4/2 6/9

3/13 3/17 3/25 3/29 4/10 4/14 4/22 4/26 5/12 5/20 5/24 6/13 6/17 6/21 6/29 4/18 4/30 5/16 5/28 6/25 3/21 Flow pH DO

Page 6 Russian River Water Quality (March 1 - July 1, 2021) Provisional Data Subject to Revision

East Fork Russian River (Below Lake Mendocino)

East Fork Russian River (Below Lake Mendocino) Water Quality Trend 13.5 28

12.5 24

11.5 20

C) ° 10.5 16

9.5 12

8.5 8

Termperature ( Termperature DO DO (mg/L)and pH

7.5 4

6.5 0

3/1 3/9 4/6 5/4 6/1 6/5 6/9 3/5 4/2 5/8

3/17 3/21 3/25 3/29 4/14 4/22 4/26 4/30 5/12 5/20 5/28 6/17 6/25 3/13 4/10 4/18 5/16 5/24 6/13 6/21 6/29 DO pH Temperature

East Fork Russian River (Below Lake Mendocino) - Difference between Daily Maximum and Minimum for DO and pH 120 4.5

4.0 100 3.5

80 3.0

2.5 60

2.0 Flow Flow (cfs) 40 1.5

1.0 20 0.5

0 0.0 in (mg/L) DO pH andDifference

3/1 3/9 4/6 5/4 5/8 6/1 6/5 3/5 4/2 6/9

3/13 3/17 3/25 3/29 4/10 4/14 4/22 4/26 5/12 5/20 5/24 6/13 6/17 6/21 6/29 4/18 4/30 5/16 5/28 6/25 3/21 Flow pH DO

Hopland Hopland Water Quality Trend 14 28

13 24

20 C)

11 ° 16 10 12 9 8

DO DO (mg/L)and pH 8 Termperature ( Termperature

7 4

6 0

4/2 4/6 5/4 5/8 6/5 6/9 3/1 3/5 3/9 6/1

3/17 3/21 3/25 3/29 4/10 4/14 4/18 4/22 4/26 4/30 6/13 6/17 6/21 6/25 6/29 3/13 5/12 5/16 5/20 5/24 5/28 DO pH Temperature

Hopland - Difference between Daily Maximum and Minimum for DO and pH 450 7.0

400 6.0 350 5.0 300

250 4.0

200 3.0 Flow (cfs) Flow 150 2.0 100 1.0 50

0 0.0 (mg/L) DO in pH and Difference

3/1 3/9 4/2 6/1 6/9 3/5 4/6 5/4 5/8 6/5

3/13 3/17 3/25 3/29 4/10 4/14 4/18 4/26 4/30 5/12 5/16 5/24 5/28 6/13 6/17 6/25 6/29 3/21 4/22 5/20 6/21 Flow pH DO

Page 7 Russian River Water Quality (March 1 - July 1, 2021) Provisional Data Subject to Revision

Jimtown Water Quality

Jimtown 28 13

12 24

11 20 C)

10 ° 16 9

8 12

DO (mg/L) DO andpH 8 6 ( Termperature 4 5

4 0

3/9 4/2 4/6 5/4 5/8 6/1 6/5 6/9 3/1 3/5

3/13 3/17 3/21 3/25 3/29 4/10 4/14 4/18 4/22 4/26 4/30 5/12 5/16 5/20 5/24 5/28 6/13 6/17 6/21 6/25 6/29 DO pH Temperature

Jimtown- Difference between Daily Maximum and Minimum for DO and pH 600 7.0

500 6.0

5.0 400 4.0 300

3.0 Flow Flow (cfs) 200 2.0

100 1.0 Difference DO in (mg/L)Difference and pH

0 0.0

3/5 3/9 4/2 5/4 5/8 6/1 6/9 3/1 4/6 6/5

3/17 3/21 3/29 4/10 4/14 4/22 4/26 5/16 5/20 5/28 6/13 6/21 6/25 3/25 4/18 4/30 5/12 5/24 6/17 6/29 3/13 Flow pH DO

Digger Bend

Digger Bend Water Quality Trend

13.5 28 12.5 24 11.5

20 C)

10.5 °

9.5 16

8.5 12 7.5

8 Termperature ( Termperature DO DO (mg/L)pH and 6.5 4 5.5

4.5 0

3/1 3/9 4/6 5/4 5/8 6/1 6/9 3/5 4/2 6/5

3/13 3/21 3/25 3/29 4/10 4/18 4/22 4/30 5/16 5/20 5/28 6/13 6/17 6/25 6/29 4/14 4/26 5/12 5/24 6/21 3/17 DO pH Temperature

Digger Bend - Difference between Daily Maximum and Minimum for DO and pH 400 6.0 Flow 350 exceeded 5.0 stream 300 gauge 400 cfs 4.0 250 maximum.

200 3.0

Flow Flow (cfs) 150 2.0 100 1.0 50

0 0.0 (mg/L) in DO pH and Difference

3/1 3/5 4/2 4/6 5/4 6/5 6/9 3/9 5/8 6/1

3/13 3/17 3/21 3/25 4/10 4/14 4/26 4/30 5/16 5/20 5/24 6/13 6/25 6/29 3/29 4/18 4/22 5/12 5/28 6/17 6/21 Flow pH DO

Page 8 Russian River Water Quality (March 1 - July 1, 2021) Provisional Data Subject to Revision

Hacienda Bridge Water Quality

Hacienda Bridge 13.5 28

12.5 24

11.5 20

C) ° 10.5 16

9.5 12 Termperature ( Termperature

DO (mg/L) DO and pH 8.5 8

7.5 4

6.5 0

3/1 3/5 3/9 4/2 4/6 5/4 5/8 6/1 6/5 6/9

3/17 3/21 4/14 4/18 4/22 4/30 5/16 5/20 5/24 6/17 6/21 6/25 3/13 3/25 3/29 4/10 4/26 5/12 5/28 6/13 6/29 DO pH Temperature

Hacienda Bridge - Difference between Daily Maximum and Minimum for DO and pH 1000 6.0

900 5.0 800

700 4.0 600

500 3.0

Flow (cfs) Flow 400 2.0 300

200 1.0

100 Difference in DO (mg/L) DO in and pH Difference

0 0.0

3/1 3/5 3/9 4/2 5/8 6/1 6/5 6/9 4/6 5/4

3/13 3/21 3/25 3/29 4/14 4/18 4/22 4/26 5/12 5/16 5/20 6/13 6/21 6/25 6/29 3/17 4/10 4/30 5/24 5/28 6/17 Flow pH DO

Precipitation Ukiah Municipal Airport (WBAN: 72590523275 (KUKI)) Date Range Cumulative (inches) Oct 1, 2020 - Jul 1, 2021 13.48 Last 7 Days* 0.00

Cumulative Precipitation Comparison of Current Year versus Historic Record 80

30 Precipitation (inches) Precipitation 20

1-Jul 8-Jul

7-Jan

3-Jun

1-Oct 8-Oct

1-Apr 8-Apr

4-Feb 2-Sep 9-Sep

3-Dec

5-Aug

15-Jul 22-Jul 29-Jul

5-Nov

4-Mar

6-May

14-Jan 21-Jan 28-Jan

10-Jun 17-Jun 24-Jun

15-Oct 22-Oct 29-Oct

15-Apr 22-Apr 29-Apr

11-Feb 18-Feb 25-Feb 16-Sep 23-Sep 30-Sep

10-Dec 17-Dec 24-Dec 31-Dec

12-Aug 19-Aug 26-Aug

19-Nov 26-Nov 12-Nov

11-Mar 18-Mar 25-Mar

20-May 27-May Historical Maximum Historical Minimum Historical Average13-May 10/1/2020 to Present

Global Forecast System Model 16-day Cumulative Precipitation Forecast

Date Range Forecasted Cumulative (inches) Jul 2 - Jul 17, 2021 0.0

Page 9 Lake Mendocino Water Accounting Weekly Report (Term 11 Feb 2021 TUCO) Report Date: 7/2/2021 Units are cfs unless noted otherwise 6/25/2021 6/26/2021 6/27/2021 6/28/2021 6/29/2021 6/30/2021 7/1/2021 I. Upper East Fork Reach Potter Valley Project Tunnel Diversion 43.0 43.0 43.0 34.0 30.0 31.0 30.0 PVID Requested Delivery 38.0 38.0 38.0 29.9 25.0 25.0 25.0 PVID Canals Actual Delivery 24.4 24.6 20.8 12.4 10.2 6.3 6.3 East Fork Release 18.6 18.4 22.2 21.6 19.8 24.7 23.8 PVID E Fork Diversions 13.6 13.4 17.2 17.5 14.8 18.7 18.8 PVID Water Use - PG&E Contract 38.0 38.0 38.0 29.9 25.0 25.0 25.0 PVID Water Use - License 5264 0.0 0.0 0.0 0.0 0.0 0.0 0.0 East Fork Downstream of PVID 5.0 5.0 5.0 4.1 5.0 6.0 5.0 PVID Canal Net Return Flow (assumed) 12.9 13.0 8.2 11.9 10.3 8.5 9.2 East Fork / Potter Valley Reach Analysis USGS E Fork @ Calpella 17.9 18.0 13.2 16.1 15.3 14.5 14.2 Net Reach Loss(-)/Gain(+) -25.1 -25.0 -29.8 -17.9 -14.7 -16.5 -15.8 Unimpaired Natural Flow @ Calpella (est.) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Non-PVID East Fork Net Reach Losses (est.) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Natural Flow 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Import (neg. value is return flow) 0.0 0.0 0.0 0.0 0.0 0.0 0.0

II. Lake Mendocino Resrvoir Operations Calculated Inflow (ac-ft) 43.7 47.4 23.0 35.8 22.9 24.5 23.6 (cfs) 22 24 12 18 12 12 12 Natural Flow 0 0 0 0 0 0 0 Import 22 24 12 18 12 12 12 Storage Change (ac-ft) -146.0 -145.0 -169.0 -155.0 -167.0 -166.0 -164.0 (cfs) -74 -73 -85 -78 -84 -84 -83 Stored Natural Flow (cfs) 0 0 0 0 0 0 0 Stored Import Water (cfs) 0 0 0 0 0 0 0 Evaporation (ac-ft) 23.6 25.8 25.7 24.1 23.3 23.9 24.2 RVCWD Diversion (ac-ft) (assum.) 0 0 0 0 0 0 0 CVD Release Gage 84 84 84 84 84 84 82 Storage (Project Water) 74 73 84 78 84 84 82 Natural Flow 0 0 0 0 0 0 0 Import Water 10 11 0 6 0 0 0 East Fork Min Instream Flow Requirement 25 25 25 25 25 25 25 Compliance Gage Rvr mi. CVD Release 99.9 84 84 84 84 84 84 82 CVD Project Water Release to Meet Min Flow Requirement Total Pass-through Water 10 11 0 6 0 0 0 Project Water Release Required Yes Yes Yes Yes Yes Yes Yes

III. Upper Russian River Reach Minimum Instream Flow Requirement 15 15 15 15 15 15 15 Controlling Compliance Gage Min Gage Flow 30 30 30 33 31 31 31 Controlling Gage Healdsburg Healdsburg Healdsburg Healdsburg Digger Bend Healdsburg Healdsburg All Compliance Gages Rvr mi. Forks (CVD + USGS 11461000) 99.0 84 84 84 84 84 84 82 Talmage (USGS 11462080) 96.1 70 70 70 69 70 70 67 Hopland (USGS 11462500) 84.8 64 66 68 67 63 61 59 Cloverdale (USGS 11463000) 70.9 62 63 64 66 64 62 61 Geyserville (USGS 11463500) 54.4 46 46 47 49 49 48 47 Jimtown (USGS 11463682) 48.5 37 37 38 38 37 36 36 Digger Bend (USGS 11463980) 38.2 35 35 35 37 31 32 32 Healdsburg (USGS 11464000) 35.6 30 30 30 33 32 31 31 Net Reach Loss(-)/Gain(+) Forks - Talmage -9 -10 -10 -11 -13 -14 -16 Talmage - Hopland -10 -8 -7 -6 -8 -10 -10 Hopland - Cloverdale -0 -1 -2 -1 -2 -0 +0 Cloverdale - Jimtown -26 -26 -26 -27 -29 -27 -26 Jimtown - Digger Bend -6 -5 -5 -6 -6 -5 -4 Digger Bend - Healdsburg +0 -0 +0 +0 -0 -1 -0 CVD Project Water Release to Meet Min Flow Requirement Net Reach Loss(-)/Gain(+) to Controlling Gage -51 -51 -50 -52 -53 -56 -56 Storage (Project Water) +51 +51 +50 +52 +53 +56 +56 Pass-through Water (Natural + Import) +0 +0 +0 +0 +0 +0 +0 Total Pass-through Water 10 11 0 6 0 0 0 Project Water Release Required Yes Yes Yes Yes Yes Yes Yes

Notes: - Water Accounting for the Upper Russian River is an analysis that approximates the current conditions based on methodology in Term 11 report and forthcoming update. Values listed include estimated and assumed values where measurements were not currently available. Lake Mendocino Water Accounting Weekly Report (Term 11 Feb 2021 TUCO) Report Date: 7/2/2021

UPPER RUSSIAN RIVER NET REACH GAINS (+) / LOSSES (-) 5

-5

-15

-25 cfs

-35

-45

-55 6/25/2021 6/26/2021 6/27/2021 6/28/2021 6/29/2021 6/30/2021 7/1/2021 Forks - Talmage Talmage - Hopland Hopland - Cloverdale Cloverdale - Jimtown Jimtown - Digger Bend Digger Bend - Healdsburg

UPPER RUSSIAN RIVER STREAM FLOWS Forks Talmage Hopland Cloverdale Min Flow Required Geyserville Jimtown Digger Bend Healdsburg 90

60 cfs 50

0 6/25/2021 6/26/2021 6/27/2021 6/28/2021 6/29/2021 6/30/2021 7/1/2021 7/2/2021

MAP OF UPPER RUSSIAN RIVER and STREAM GAGES