Num Name Elev. Date Depth Water Density April 1 Average
Content
Shasta River Basin
1 Parks Creek 6,700 29-JAN 24.0 7.4 31% 37.4 20%
3 Sweetwater 5,850 29-JAN 18.0 2.7 15% 13.7 20%
Basin Average Pct. of April 1: 20%
February 1: 32%
Scott River Basin
5 Middle Boulder 1 6,600 29-JAN 22.6 7.1 31% 32.4 22%
311 Middle Boulder 3 6,200 29-JAN 19.4 6.1 31% 28.3 22%
298 Dynamite Meadow 5,700 29-JAN 14.1 3.3 23% 18.6 18%
285 Swampy John 5,500 29-JAN 35.7 12.8 36% 34.0 38%
Basin Average Pct. of April 1: 25%
February 1: 40%
Trinity River Basin
9 Deadfall Lakes 7,200 27-JAN 22.5 5.3 24% 34.2 15%
10 Red Rock Mountain 6,700 Scheduled for measurement by Weaverville Ranger District
11 Bear Basin 6,500 Scheduled for measurement by Weaverville Ranger District
12 Shimmy Lake 6,400 Scheduled for measurement by Weaverville Ranger District
16 Highland Lakes 6,030 Scheduled for measurement by Weaverville Ranger District
437 Paradise Peak 5,800 Scheduled for measurement by Hayfork Ranger District
17 Big Flat (Course) 5,100 Scheduled for measurement by Weaverville Ranger District
Basin Average Pct. of April 1: 15%
February 1: 25%
Sacramento River Basin
18 Mount Shasta 7,900 03-FEB 24.4 8.0 33% 53.6 15%
19 Sand Flat (Course) 6,800 02-FEB 21.7 6.7 31% 43.6 15%
21 Gray Rock Lakes 6,200 30-JAN 22.6 7.8 35% 48.4 16%
22 Slate Creek 5,700 Scheduled for measurement by Weaverville Ranger District
Basin Average Pct. of April 1: 15%
February 1: 24%
Mc Cloud River Basin
23 Brewer Creek 6,250 29-JAN 19.3 6.4 33% 36.2 18%
25 Stouts Meadow 5,400 28-JAN 29.8 10.2 34% 37.8 27%
Basin Average Pct. of April 1: 22%
February 1: 35%
Pit River Basin
30 Cedar Pass 7,100 03-FEB 27.1 9.0 33% 16.7 54%
28 Blue Lake Ranch 6,800 02-FEB 19.9 5.8 29% 10.4 56%
33 Thousand Lakes 6,500 29-JAN 30.0 11.0 37% 34.6 32%
35 Adin Mountain 6,200 30-JAN 24.8 7.4 30% 12.5 59%
343 New Manzanita Lake 5,900 03-FEB 19.8 6.2 31% 8.0 78%
Basin Average Pct. of April 1: 56%
February 1: 87%
Cottonwood Cr Basin
436 Bully Choop 6,100 Scheduled for measurement by Hayfork Ranger District
Stony Cr Basin
62 Anthony Peak 6,200 28-JAN 21.6 7.9 37% 30.1 26%
Basin Average Pct. of April 1: 26%
February 1: 41%
Feather River Basin
47 Lower Lassen Peak 8,250 28-JAN 70.8 26.2 37% 80.2 33%
361 Kettle Rock 7,300 02-FEB 22.8 7.1 31% 23.4 30%
48 Mount Dyer 1 7,100 28-JAN 29.9 9.5 32% 25.9 37%
359 Grizzly Ridge 6,900 28-JAN 33.7 10.5 31% 30.4 35%
279 Eureka Bowl 6,800 27-JAN 33.6 10.7 32% 42.7 25%
388 Pilot Peak (DWR) 6,800 29-JAN 38.8 14.2 37% 45.5 31%
360 Mount Hough 6,700 30-JAN 28.7 8.8 31% 30.7 29%
280 Rowland Creek 6,700 29-JAN 15.9 4.0 25% 17.4 23%
75 Church Meadows 6,700 27-JAN 33.5 11.6 35% 30.7 38%
53 Three Lakes 6,250 29-JAN 34.1 11.4 33% 40.8 28%
52 Eureka Lake 6,200 27-JAN 28.3 8.3 29% 31.7 26%
51 Harkness Flat 6,200 28-JAN 25.2 8.8 35% 28.5 31%
290 Mount Dyer 2 6,050 28-JAN 21.7 7.0 32% 16.6 42%
54 Mill Creek Flat 5,900 28-JAN 33.7 11.8 35% 39.0 30%
353 Frenchman Cove 5,800 29-JAN 3.9 1.3 33% 2.1 62% *
354 Antelope Ridge 5,650 02-FEB 10.8 3.2 30% 3.0 107% *
355 Abbey 5,650 28-JAN 16.9 4.7 28% 9.0 52%
49 Letterbox 5,600 29-JAN 43.7 17.1 39% 49.0 35%
55 Mount Stover 5,600 28-JAN 11.6 3.7 32% 14.7 25%
58 Feather River Meadow 5,400 28-JAN 23.5 8.2 35% 23.1 35%
56 Browns Camp 5,400 28-JAN 21.5 7.3 34% 23.3 31%
59 Warner Creek 5,100 28-JAN 18.7 6.7 36% 14.7 46%
434 Humbug Summit 2 4,850 28-JAN 12.6 4.2 33% 14.3 29%
61 Chester Flat 4,600 30-JAN 7.7 3.1 40% 6.1 51%
Basin Average Pct. of April 1: 34%
February 1: 53%
Yuba River Basin
64 Webber Peak 7,800 27-JAN 39.2 13.7 35% 41.9 33%
65 Castle Creek 5 7,400 Scheduled for measurement by Central Sierra Snow Lab
66 Meadow Lake 7,200 28-JAN 57.2 20.6 36% 55.8 37%
67 Red Mountain 7,200 28-JAN 47.9 17.2 36% 51.9 33%
68 English Mountain 7,100 27-JAN 44.7 16.1 36% 45.4 35%
69 Donner Summit 6,900 28-JAN 34.9 11.8 34% 38.6 31%
74 Yuba Pass 6,700 30-JAN 31.7 11.6 37% 29.6 39%
76 Furnace Flat 6,700 28-JAN 44.4 16.6 37% 48.4 34%
78 Findley Peak 6,500 27-JAN 34.0 11.2 33% 29.8 38%
77 Lake Fordyce 6,500 28-JAN 37.5 13.9 37% 40.9 34%
389 Robinson Cow Camp Snow 6,480 29-JAN 38.8 14.6 38% 42.5 34%
390 Sunnyside Meadow 6,300 29-JAN 47.3 18.0 38% 55.4 32%
80 Cisco 5,900 27-JAN 34.2 12.2 36% 27.6 44%
372 Chapman Creek 5,850 30-JAN 29.0 9.8 34% 23.7 41%
83 Bowman Lake 5,650 27-JAN 27.6 8.6 31% 22.3 39%
391 Lexington 5,600 02-FEB 33.8 13.7 41% 30.7 45%
277 Gibsonville 5,400 02-FEB 35.4 10.7 30% 28.7 37%
85 Lake Spaulding 5,200 28-JAN 30.8 11.4 37% 21.3 54%
429 Chalk Bluff 4,850 27-JAN 18.9 6.9 37%
Basin Average Pct. of April 1: 38%
February 1: 59%
American River Basin
106 Upper Carson Pass 8,500 30-JAN 40.6 15.1 37% 36.2 42%
331 Lower Carson Pass 8,400 30-JAN 44.2 16.4 37% 39.2 42%
107 Caples Lake (DWR) 8,000 30-JAN 33.5 12.0 36% 30.8 39%
365 Alpha 7,600 30-JAN 33.1 13.6 41% 33.8 40%
338 Lost Corner Mountain 7,500 30-JAN 39.1 15.8 40% 36.2 44%
108 Echo Summit 7,450 29-JAN 33.5 11.3 34% 33.8 33%
110 Lake Audrain 7,300 29-JAN 39.5 12.7 32% 35.3 36%
109 Silver Lake 7,100 30-JAN 24.6 9.2 37% 21.0 44%
316 Wrights Lake 6,900 29-JAN 38.3 13.8 36% 32.8 42%
113 PHillips 6,800 29-JAN 34.6 13.1 38% 27.6 47%
320 Lyons Creek 6,700 28-JAN 45.4 15.5 34% 31.8 49%
115 Huysink 6,600 30-JAN 66.6 16.2 24% 45.0 36%
289 Tamarack Flat 6,550 29-JAN 37.4 13.2 35% 28.4 46%
114 Wabena Meadows 6,300 27-JAN 46.8 15.6 33% 42.8 36%
369 Miranda Cabin 6,200 27-JAN 46.4 16.0 34% 40.0 40%
120 Onion Creek 6,100 02-FEB 23.3 9.3 40% 19.6 47%
371 Diamond Crossing 6,050 27-JAN 31.5 10.3 33% 22.0 47%
122 Talbot Camp 5,750 27-JAN 31.4 10.5 33% 20.9 50%
322 Robbs Valley 5,600 30-JAN 23.7 8.7 37% 15.6 56%
127 Ice House 5,300 30-JAN 14.2 4.8 34% 5.8 83%
Basin Average Pct. of April 1: 45%
February 1: 70%
Mokelumne River Basin
323 Highland Meadow 8,700 26-JAN 77.1 23.8 31% 48.7 49%
364 Tragedy Creek 8,150 30-JAN 42.5 14.6 34% 45.0 32%
129 Blue Lakes 8,000 27-JAN 44.8 13.4 30% 36.2 37%
131 Wheeler Lake 7,800 26-JAN 67.4 22.0 33% 53.3 41%
132 Pacific Valley 7,500 26-JAN 48.4 16.6 34% 38.9 43%
363 Podesta 7,200 31-JAN 40.7 15.0 37% 44.8 33%
133 Corral Flat 7,200 30-JAN 42.5 15.5 36% 40.5 38%
134 Bear Valley Ridge 1 6,700 27-JAN 33.4 11.7 35% 24.6 48%
435 Lumberyard 2 6,500 30-JAN 15.8 7.1 45% 13.8 51%
136 Hams Station 5,500 31-JAN 7.5 3.1 41% 5.3 58% *
137 Antelope Springs 4,350 31-JAN 8.8 3.6 41% 2.9 124% *
Basin Average Pct. of April 1: 41%
February 1: 66%
Stanislaus River Basin
345 Deadman Creek 9,250 27-JAN 55.8 15.8 28% 35.1 45%
344 Clark Fork Meadow 8,900 27-JAN 57.7 16.5 29% 39.8 41%
427 Gianelli Meadow 8,400 26-JAN 70.5 21.4 30% 52.9 40%
138 Lower Relief Valley 8,100 27-JAN 50.1 15.9 32% 39.6 40%
139 Soda Creek Flat 7,800 27-JAN 28.8 7.6 26% 22.0 35%
384 Stanislaus Meadow 7,750 26-JAN 57.6 18.8 33% 51.0 37%
140 Eagle Meadow 7,500 27-JAN 39.7 12.0 30% 24.2 50%
142 Herring Creek 7,300 28-JAN 40.4 13.9 34% 28.0 50%
143 Relief Dam 7,250 27-JAN 30.9 9.3 30% 19.9 47%
416 Bloods Creek 7,200 29-JAN 44.4 14.8 33% 34.6 43%
432 Sapps Hollow 6,950 30-JAN 40.9 15.6 38% 33.0 47%
430 Corral Meadow 6,650 30-JAN 30.4 10.1 33% 19.7 51%
373 Hells Kitchen 6,550 29-JAN 25.6 8.3 32% 21.8 38%
145 Niagara Flat 6,500 28-JAN 35.9 12.0 33% 19.6 61%
386 Black Springs 6,500 29-JAN 27.8 11.2 40% 22.0 51%
Basin Average Pct. of April 1: 45%
February 1: 72%
Tuolumne River Basin
157 Dana Meadows 9,800 27-JAN 56.6 15.2 27% 31.1 49%
158 Rafferty Meadows 9,400 28-JAN 64.8 15.7 24% 32.8 48%
159 Bond Pass 9,300 27-JAN 64.6 19.6 30% 44.9 44%
368 New Grace Meadow 8,900 31-JAN 60.2 20.7 34% 48.0 43%
161 Tuolumne Meadows 8,600 26-JAN 33.2 9.1 27% 22.7 40%
162 Horse Meadow 8,400 27-JAN 57.1 18.2 32% 46.7 39%
163 Wilma Lake 8,000 31-JAN 56.2 19.4 35% 43.2 45%
165 Sachse Springs 7,900 29-JAN 39.9 14.3 36% 38.1 38%
166 Huckleberry Lake 7,800 28-JAN 49.2 16.2 33% 41.9 39%
164 Spotted Fawn 7,800 29-JAN 47.9 14.6 30% 45.6 32%
167 Paradise Meadow 7,650 30-JAN 50.6 17.3 34% 39.9 43%
348 Kerrick Corral 7,000 25-JAN 39.8 14.2 36% 23.5 60%
168 Upper Kibbie Ridge 6,700 30-JAN 22.6 9.0 40% 18.6 48%
173 Lower Kibbie 6,700 30-JAN 28.8 11.3 39% 26.0 43%
169 Vernon Lake 6,700 29-JAN 33.8 12.9 38% 22.4 58%
171 Beehive Meadow 6,500 29-JAN 36.8 13.4 36% 23.5 57%
172 Bell Meadow 6,500 25-JAN 26.3 7.9 30% 15.5 51%
Basin Average Pct. of April 1: 46%
February 1: 73%
Merced River Basin
176 Snow Flat 8,700 30-JAN 55.9 20.8 37% 44.5 47%
177 Ostrander Lake 8,200 28-JAN 45.1 15.1 33% 32.6 46%
178 Tenaya Lake 8,150 31-JAN 41.1 13.3 32% 33.6 40%
179 Gin Flat (Course) 7,000 29-JAN 30.9 14.6 47% 32.0 46%
180 Peregoy Meadows 7,000 31-JAN 28.9 9.2 32% 29.3 31%
Basin Average Pct. of April 1: 42%
February 1: 67%
San Joaquin River Basin
182 Mono Pass 11,450 28-JAN 43.6 11.7 27% 30.8 38%
183 Piute Pass 11,300 27-JAN 57.7 15.9 28% 37.9 42%
276 Pioneer Basin 10,400 28-JAN 54.6 15.8 29% 34.0 46%
186 Volcanic Knob 10,050 28-JAN 43.6 11.1 25% 30.7 36%
187 Rose Marie 10,000 28-JAN 52.1 14.4 28% 29.7 48%
189 Agnew Pass 9,450 Scheduled for measurement by Southern California Edison Company, Bishop
190 Kaiser Pass 9,100 26-JAN 51.4 15.1 29% 39.0 39%
191 Dutch Lake 9,100 27-JAN 35.1 10.6 30% 28.1 38%
192 Coyote Lake 8,850 28-JAN 39.3 12.7 32% 32.2 39%
346 Badger Flat 8,300 28-JAN 40.1 13.0 32% 30.8 42%
194 Nellie Lake 8,000 27-JAN 51.2 18.4 36% 35.8 51%
324 Lake Thomas A Edison 7,800 27-JAN 21.4 6.6 31% 14.7 45%
196 Chilkoot Lake 7,450 28-JAN 36.4 13.0 36% 36.8 35%
347 Tamarack Creek 7,250 29-JAN 29.0 9.7 33% 23.8 41%
198 Florence Lake 7,200 27-JAN 11.5 2.8 24% 7.6 37%
197 Chilkoot Meadow 7,150 28-JAN 42.0 15.2 36% 36.6 42%
199 Huntington Lake 7,000 26-JAN 30.0 8.6 29% 18.6 46%
204 Poison Meadow 6,800 27-JAN 28.6 11.0 38% 24.8 44%
Basin Average Pct. of April 1: 42%
February 1: 66%
Kings River Basin
222 Bishop Pass 11,200 02-FEB 41.5 13.7 33% 35.0 39%
299 Charlotte Ridge 10,700 25-JAN 55.8 13.6 24% 29.9 45%
307 Bullfrog Lake 10,650 25-JAN 51.6 13.9 27% 28.5 49%
398 Bench Lake 10,600 28-JAN 45.3 12.9 28% 27.1 48%
223 Blackcap Basin 10,300 27-JAN 56.2 15.0 27% 34.1 44%
396 Rattlesnake Creek Ba 9,900 28-JAN 48.5 14.3 29% 39.8 36%
225 Beard Meadow 9,800 27-JAN 54.5 14.4 26% 33.3 43%
224 Upper Burnt Corral 9,700 27-JAN 63.6 17.2 27% 37.8 46%
397 Scenic Meadow 9,650 28-JAN 29.7 9.4 32% 24.1 39%
229 Round Corral 9,000 28-JAN 46.4 14.4 31% 35.8 40%
226 Rowell Meadow 8,850 28-JAN 31.2 11.2 36% 26.5 42%
227 Woodchuck Meadow 8,800 28-JAN 40.9 11.6 28% 31.5 37%
232 Long Meadow (Kings R) 8,500 27-JAN 37.8 10.0 26% 29.3 34%
426 Courtright 8,350 29-JAN 25.6 7.6 30% 30.7 25%
233 Statum Meadow 8,300 29-JAN 36.9 16.8 45% 32.3 52%
230 Helms Meadow 8,250 29-JAN 33.5 10.6 32% 26.7 40%
234 Post Corral Meadow 8,200 27-JAN 37.7 10.8 29% 26.3 41%
308 Dodsons Meadow 8,050 27-JAN 33.3 8.7 26% 29.6 29%
237 Horse Corral Meadow 7,600 28-JAN 21.0 7.8 37% 16.3 48%
236 Big Meadows 7,600 28-JAN 27.5 8.8 32% 24.6 36%
438 Ridge Trail 7,500 25-JAN 11.0 4.0 36%
239 Fred Meadow 6,950 28-JAN 25.4 8.6 34% 21.3 40%
240 Grant Grove 6,600 Scheduled for measurement by Sequoia and Kings Canyon National Parks
Basin Average Pct. of April 1: 41%
February 1: 67%
Kaweah River Basin
292 Farewell Gap 9,500 01-FEB 49.5 17.0 34% 35.8 47%
243 Panther Meadow 8,600 25-JAN 47.5 15.9 33% 36.7 43%
245 Mineral King 8,000 31-JAN 28.0 11.0 39% 20.6 53%
246 Giant Forest 6,400 Scheduled for measurement by Sequoia and Kings Canyon National Parks
Basin Average Pct. of April 1: 48%
February 1: 79%
Tule River Basin
247 Quaking Aspen 7,000 Scheduled for measurement by Tule River Ranger District
Kern River Basin
250 Bighorn Plateau 11,350 25-JAN 37.8 10.0 26% 23.7 42%
251 Cottonwood Pass 11,050 31-JAN 14.3 3.8 27% 14.8 26%
252 Siberian Pass 10,900 28-JAN 21.4 6.4 30% 20.0 32%
253 Crabtree Meadow 10,700 24-JAN 29.9 7.4 25% 19.6 38%
255 Tyndall Creek 10,650 25-JAN 33.2 7.0 21% 18.8 37%
254 Guyot Flat 10,650 27-JAN 32.3 8.4 26% 20.8 40%
275 Sandy Meadows 10,650 25-JAN 29.0 6.9 24% 19.2 36%
257 Big Whitney Meadow 9,750 30-JAN 22.6 5.3 23% 17.2 31%
256 Rock Creek 9,600 27-JAN 25.1 6.3 25% 17.8 35%
258 Round Meadow 9,000 03-FEB 24.2 8.9 37% 24.1 37%
259 Ramshaw Meadows 8,700 30-JAN 12.9 4.2 33% 11.5 37%
260 Little Whitney Meadow 8,500 29-JAN 16.7 6.0 36% 12.9 47%
261 Bonita Meadows 8,300 03-FEB 16.2 7.0 43% 13.6 51%
262 Casa Vieja Meadows 8,300 02-FEB 24.2 9.1 38% 19.8 46%
265 Beach Meadows 7,650 03-FEB 12.3 5.3 43% 8.3 64%
249 Dead Horse Meadow 7,300 Scheduled for measurement by Hot Springs Ranger District
Basin Average Pct. of April 1: 40%
February 1: 65%
Surprise Valley Basin
313 Barber Creek 6,500 Scheduled for measurement by Warner Mountain Ranger District
350 49 Mountain 6,000 Scheduled for measurement by Natural Resources Conservation Service
Truckee River Basin
318 Squaw Valley 2 7,700 28-JAN 52.0 18.3 35% 48.4 38%
89 Webber Lake 7,000 27-JAN 37.9 12.9 34% 31.7 41%
Basin Average Pct. of April 1: 39%
February 1: 62%
Lake Tahoe Basin
99 Rubicon Peak 2 7,500 29-JAN 33.8 12.5 37% 30.8 41%
100 Freel Bench 7,300 30-JAN 16.0 5.9 37% 10.4 57%
101 Ward Creek 2 7,000 29-JAN 38.4 14.6 38% 41.8 35%
333 Glenbrook 2 (Nevada) 6,900 30-JAN 12.0 3.1 26% 11.6 27%
103 Richardsons 2 6,500 28-JAN 19.0 6.8 36% 15.6 44%
104 Upper Truckee 6,400 30-JAN 13.0 4.7 36% 7.4 64%
Basin Average Pct. of April 1: 44%
February 1: 70%
Walker River Basin
421 Leavitt Lake 9,600 28-JAN 74.0 23.2 31% 50.8 46%
150 Virginia Lakes 9,400 Scheduled for measurement by CA Dept of Water Resources
377 Virginia Lakes Ridge 9,300 29-JAN 25.6 6.5 25% 19.5 33%
422 Sawmill Ridge 8,750 28-JAN 29.0 7.8 27% 18.8 41%
152 Sonora Pass 8,750 27-JAN 32.4 9.5 29% 24.9 38%
154 Willow Flat 8,250 28-JAN 23.0 5.7 25% 9.9 58%
Basin Average Pct. of April 1: 43%
February 1: 69%
Mono Lake Basin
281 Gem Pass 10,750 Scheduled for measurement by Southern California Edison Company, Bishop
181 Tioga Pass 9,800 29-JAN 48.0 13.8 29% 26.8 51%
287 Saddlebag Lake 9,750 29-JAN 53.1 15.3 29% 31.3 49%
286 Ellery Lake 9,600 29-JAN 53.0 13.7 26% 29.0 47%
282 Gem Lake 9,150 Scheduled for measurement by Southern California Edison Company, Bishop
Basin Average Pct. of April 1: 49%
February 1: 78%
Owens River Basin
284 Bishop Lake 11,300 01-FEB 41.4 12.8 31% 21.9 58%
220 Cottonwood Lakes 2 11,100 21-JAN 11.5 2.7 23% 14.1 19%
212 East Piute Pass 10,800 26-JAN 34.9 8.8 25% 15.2 58%
213 Sawmill 10,200 01-FEB 27.7 6.6 24% 19.0 35%
221 Cottonwood Lakes 1 10,150 21-JAN 13.1 2.7 21% 12.3 22%
209 Rock Creek 3 10,000 28-JAN 21.6 5.4 25% 14.7 37%
217 Big Pine Creek 1 10,000 27-JAN 27.5 6.1 22% 22.6 27%
218 Big Pine Creek 3 9,800 27-JAN 26.7 5.3 20% 18.3 29%
219 Big Pine Creek 2 9,700 27-JAN 16.9 3.3 20% 14.8 22%
205 Mammoth Pass (Ladwp) 9,300 29-JAN 61.2 19.9 33% 41.9 47%
214 North Lake 9,300 26-JAN 14.1 3.9 28% 10.2 38%
423 Trailhead 9,100 26-JAN 16.3 4.1 25% 13.2 31%
210 Rock Creek 2 9,050 28-JAN 17.0 3.9 23% 11.0 35%
206 Minarets 2 9,000 29-JAN 42.3 13.7 32% 29.1 47%
211 Rock Creek 1 8,700 28-JAN 14.1 3.3 23% 7.5 44%
208 Mammoth 8,300 29-JAN 28.0 10.0 36% 20.2 50%
Basin Average Pct. of April 1: 37%
February 1: 60%
| Region | No. Basins | No. Courses | Avg WC | % Average April 1 | % Average February 1 |
|---|---|---|---|---|---|
| North Coast | 3 | 7 | 6.4" | 22% | 35% |
| Sacramento | 6 | 71 | 10.8" | 37% | 58% |
| San Joaquin Valley | 5 | 63 | 13.8" | 44% | 69% |
| Tulare Lake | 3 | 39 | 10.2" | 41% | 67% |
| North Lahontan | 3 | 13 | 10.1" | 43% | 68% |
| South Lahontan | 2 | 19 | 8.2" | 39% | 62% |
| Statewide Average (weighted) | 39% | 62% | |||
Data are preliminary and subject to revision. This document is updated hourly during the data-collection period.