442:
29:
85:
78:
235:
1782:
1807:
1774:
1757:
1235:
848:
between 1959 and 1969; these projects and accidents were declassified in 1989. The first accident, in 1959, was the most serious with a full meltdown. The extent of the accident is unknown due to instrument limitations, other than that it released extensive radiation. More radiation was released in
821:
the early 1960s suburban expansion of metropolitan Los
Angeles brought the development of small to significantly sized parcels of land in the Simi Hills. Hillside subdivisions regraded natural contours into terraced lots, changing the Hills viewshed, drainage patterns, and habitats in those areas.
853:
20 years later. The groundwater under portions of the Simi Hills, contaminated with toxins and radionuclides that were also historically used at SSFL, has been and is a key concern in new development decisions and the SSFL property's future limited to parkland use after an impending cleanup,
751:. This peak in the Simi Hills (aka: Castle Peak) is one of nine alignment points in Chumash territory and is essential to maintaining the balance of the natural world. Upstream were healing springs and are rock outcrop 'grinding stones.' The
1202:
670:, all of the transverse ranges fauna community. The Simi Hills are a critical wildlife corridor linkage for the Santa Monica Mountains to these and other Transverse Ranges further east. The undeveloped native
460:
1060:"Permeability of a fault zone crosscutting a sequence of sandstones and shales and its influence on hydraulic head distribution in the Chatsworth Formation, California, USA"
1212:
1915:
287:
The Simi Hills are aligned east-west and run for 26 miles (42 km), and average around 7 mi (11 km) north-south. The Simi Hills are part of the central
790:, beside the Peak and named for it, was issued to one Chumash and two Tongva people and a rare instance of Native Americans being grantees, by Mexican Governor
1920:
693:
property, a crucial wildlife corridor to the Santa
Susanas, has been proposed for public open space parkland after the closed site's cleanup completion.
147:
505:, block these winds from the Conejo Valley. The Simi Hills further block these winds, which bring cool weather in both summer and winter from the
1950:
889:
1710:
1307:
1930:
1925:
950:
903:
775:
767:
1386:
1354:
1282:
1338:
762:
The Juan
Bautista de Anza expedition passed through the area in 1769, being the first European sighting of the Simi Hills. The U.S.
1155:
1121:
1038:
1472:
940:
720:
1960:
1486:
1650:
1146:
1112:
1029:
1703:
954:
924:
827:
675:
542:
77:
1269:
1945:
1940:
274:
441:
1955:
999:
874:
858:
740:
390:
953:- (previously the Ahmanson Ranch Park), 3,000 acres (12 km²) Park in the southern Simi Hills, managed by the
1151:
1117:
1034:
756:
335:
300:
256:
210:
133:
1863:
1562:
1550:
28:
1696:
1503:
1141:
1107:
1024:
934:
837:
690:
1935:
1868:
343:
140:
1873:
1460:
1404:
National Park
Service: official Juan Bautista de Anza National Historic Trail website. accessed 4/06/2010
944:
327:
252:
1910:
893:
850:
697:
631:
292:
206:
129:
1816:
1766:
841:
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347:
1314:
1834:
1825:
994:
861:
is in the planning stages and includes the Simi Hills open space parklands and proposed new areas.
752:
683:
674:
provides routes that protect larger land wildlife of the Santa
Monicas from genetic isolation. The
639:
494:
339:
1796:
1788:
1737:
1539:
1515:
907:
878:
818:
806:
549:
538:
410:
351:
331:
323:
319:
245:
1383:
1358:
413:. 90% of the Santa Susana Field Lab property drains into the Los Angeles River via tributaries.
1829:
1820:
977:
972:
659:
655:
448:
366:
358:
1004:
840:(SSFL) for open-air testing of rocket engines from 1947 to 1990, and the site of experimental
787:
1838:
1473:
http://www.modernhiker.com/2010/06/03/rim-of-the-valley-corridor-study-begins/comment-page-1/
1250:
763:
667:
615:
346:
are also located in Los
Angeles County, generally southwest of the Simi Hills. The cities of
1732:
1244:
1180:
1071:
899:
771:
744:
430:
8:
1905:
1792:
1207:
623:
607:
506:
307:
1075:
1089:
663:
651:
1176:
689:
Large sections of the Simi Hills are protected by parks and open space preserves. The
1742:
1332:
1093:
982:
918:
587:
562:
402:
362:
288:
202:
1425:
1413:
1079:
870:
845:
795:
748:
595:
485:
is rare in the Simi Hills, even in the highest areas. Summers are warm and dry and
398:
1647:
1635:
805:
in the Simi Hills for filming motion pictures on location. The gated community of
1667:
1654:
1611:
1586:
1574:
1527:
1390:
930:
883:
736:
679:
502:
426:
179:
1598:
723:
for settlements and hunting grounds. The
Chumash had the established village of
1688:
823:
731:(Bell Canyon). It was a multicultural 'crossroads' destination, where Chumash,
717:
578:
572:
465:
Panoramic view of the Simi Hills looking north from the Santa Monica
Mountains.
378:
198:
1084:
1059:
1899:
1448:
1437:
1239:
779:
732:
713:
583:
498:
385:
and numerous seasonal streams. They include Las
Virgenes Creek (tributary of
315:
218:
162:
149:
1246:
California Red-Legged Frogs: Santa Monica
Mountains National Recreation Area
354:(to the north) are in the hills and adjacent valleys within Ventura County.
1638:
official Santa Susana Pass State Historic Park website. accessed 1/25/2010.
1563:
http://venturacountytrails.org/RecentPhotos/2010-02-13CastlePeak/_Page.html
1551:
http://www.recreationparks.net/CA/los-angeles/el-escorpion-park-los-angeles
701:
490:
401:(northern fork). Bell Creek and Arroyo Calabasas are the headwaters of the
393:, Dayton Creek, Woolsey Canyon Creek, Brandeis Creek, Runkle Canyon Creek,
386:
1504:
http://www.recreationparks.net/CA/los-angeles/bell-canyon-park-los-angeles
967:
809:
began development of geographic Bell Canyon in the 1968. To the north of
802:
650:
The Simi Hills is the principal, and much wider, of only two terrestrial
394:
311:
791:
1746:
912:
834:
783:
603:
406:
259: in this section. Unsourced material may be challenged and removed.
214:
98:
1886:
Santa Monica Mountains National Recreation Area: NPS local Park-Finder
1461:
http://www.glendalenewspress.com/news/gnp-valley060510,0,1520788.story
1487:"Three lawmakers urge Park Service action on Rim of the Valley study"
567:
557:
545:
534:
531:
523:
422:
34:
1885:
1428:
State DTSC-SSFL Groundwater Interactive Database. accessed 4/06/2010
1416:
State DTSC-SSFL_Area IV Nuclear Research section. accessed 4/06/2010
1058:
Cilona, Antonino; Aydin, Atilla; Johnson, Nicholas M. (March 2015).
234:
16:
Mountain range of the Transverse Ranges in California, United States
810:
486:
296:
477:
Because of its low elevation, the Simi Hills typically experience
822:
The extensive planned new community projects at Jordan Ranch and
671:
1864:
Ventura County Trails.org: Escorpión Peak Park + Bell Creek Park
1657:
Santa Susana Pass State Historic Park info. accessed 11/22/2009.
1370:
Ahmanson Ranch Becomes Private Preserve," [Wishtoyo Foundation
489:
do occur here. Cool winds from the Pacific Ocean come from the
382:
56:
1516:
http://www.nps.gov/samo/planyourvisit/cheeseboropalocomado.htm
318:
lies to the southwest. The San Fernando Valley communities of
1874:
Ventura County Trails.org: Wood + Lang Ranches Regional Parks
830:
keeping extensive Hills acreage natural in open space parks.
801:
In the first half of the 20th century, there were four large
459:
1401:
1177:"4 new mountain lion kittens found in California mountains"
482:
478:
184:
1565:
venturacountytrails.org-Escorpion Peak. accessed 4/04/2010
1371:
798:
was to the west, and included that end of the Simi Hills.
854:
initiating preservation of more open space in the range.
527:
1869:
Ventura County Trails.org: Cheeseboro-Palo Commado Parks
1577:
www.lamountains. Rocky Peak Park. access date: 6/6/2010
1518:
Cheeseboro/Palo Comado Canyon Park. accessed 6/6/2010.
1203:"Den of Mountain Lion Kittens Found in Unlikely Place"
712:
The Simi Hills were inhabited for over 8,000 years by
330:
are in the eastern hills and adjacent valley floor in
291:
System. They lie almost entirely within southeastern
530:
savanna. The northern rocky hills area is primarily
1057:
826:were eventually stopped by local citizens and the
451:, with the Santa Monica Mountains in the distance.
1916:Mountain ranges of Los Angeles County, California
1426:http://www.dtsc-ssfl.com/default.asp?V_DOC_ID=942
1414:http://www.dtsc-ssfl.com/default.asp?V_DOC_ID=959
1355:"Wishtoyo - Projects - Cultural - Ahmanson Ranch"
1897:
1718:
1648:http://www.lamountains.com/parks.asp?parkid=123
1636:http://www.parks.ca.gov/default.asp?page_id=611
890:Santa Monica Mountains National Recreation Area
700:is small and isolated, and was impacted by the
522:The southern lower hills are mostly covered in
357:The two nearby mountain ranges are: the higher
1587:http://www.lamountains.com/parks.asp?parkid=53
1575:http://www.lamountains.com/parks.asp?parkid=51
1528:http://www.lamountains.com/parks.asp?parkid=83
1384:Wishtoyo on Ahmanson Ranch accessed 10-23-2007
778:and Cheeseboro/Palo Comado Canyon Park to the
774:and crosses across the southern Hills through
678:is a proposed vegetated overpass spanning the
306:The Simi Hills are on the western edge of the
1921:Mountain ranges of Ventura County, California
1704:
1599:http://www.lamountains.com/maps/sageRanch.pdf
951:Upper Las Virgenes Canyon Open Space Preserve
904:Juan Bautista de Anza National Historic Trail
776:Upper Las Virgenes Canyon Open Space Preserve
768:Juan Bautista de Anza National Historic Trail
1601:SMMC-Sage Ranch Park Map. accessed 2/28/2010
1589:SMMC-Sage Ranch Park Info. accessed 6/6/2010
888:Cheeseboro/Palo Comado Canyon Park - in the
493:and blow into the inland areas through the
433:(aka: Castle Peak), 1,475 ft (450 m).
397:, Palo Comado Creek, Cheeseboro Creek, and
1711:
1697:
1449:http://smmc.ca.gov/ROV%20Master%20Plan.pdf
377:The hills provide the complete or partial
1083:
704:swept through the area in November 2018.
275:Learn how and when to remove this message
1156:United States Department of the Interior
1122:United States Department of the Interior
1039:United States Department of the Interior
1553:El Escorpión Park. accessed 11/22/2009.
1951:Geography of Thousand Oaks, California
1898:
1506:Bell Canyon Park. accessed 11/22/2009.
1343:SSPSHP Ethnohistory Accessed 2/28/2010
1337:: CS1 maint: archived copy as title (
447:View of Simi Hills looking south from
1692:
1530:Cheeseboro Park. accessed 11/22/2009.
1484:
1174:
941:Santa Susana Pass State Historic Park
638:) is also an important member of the
1931:Geography of Simi Valley, California
1926:Geography of the San Fernando Valley
1728:
1200:
257:adding citations to reliable sources
228:
1175:Myers, Amanda Lee (June 19, 2018).
1147:Geographic Names Information System
1113:Geographic Names Information System
1030:Geographic Names Information System
1017:
405:, by name its beginning with their
13:
1540:Cheeseboro/Palo Comado Canyon Park
955:Santa Monica Mountains Conservancy
925:Ronald Reagan Presidential Library
828:Santa Monica Mountains Conservancy
676:Wallis Annenberg Wildlife Crossing
543:California chaparral and woodlands
512:
84:
37:, highest summit of the Simi Hills
14:
1972:
1852:
947:in the rocky northern Simi Hills.
541:. The Simi Hills are part of the
501:, though some low hills, such as
361:adjacent on the northeast across
295:, with some southern and eastern
1805:
1780:
1772:
1755:
1438:Rim of the Valley Trail Corridor
1238: This article incorporates
1233:
961:
859:Rim of the Valley Trail Corridor
833:The Simi Hills were home of the
770:which enters at Moore Canyon in
739:peoples traded and lived beside
458:
440:
369:running nearby along the south.
233:
83:
76:
27:
1660:
1641:
1629:
1604:
1592:
1580:
1568:
1556:
1544:
1533:
1521:
1509:
1497:
1485:Kamal, Sameea (March 4, 2015).
1478:
1466:
1454:
1442:
1431:
1419:
1407:
1395:
1377:
1346:
1300:
1152:United States Geological Survey
1118:United States Geological Survey
1035:United States Geological Survey
244:needs additional citations for
1275:
1263:
1227:
1194:
1168:
1134:
1100:
1051:
757:Rock art of the Chumash people
1:
1806:
1756:
1201:Roth, Annie (June 21, 2018).
1010:
935:Santa Susana Field Laboratory
838:Santa Susana Field Laboratory
691:Santa Susana Field Laboratory
429:, 2,314 ft (700 m), and
421:Peaks in this region include
372:
1781:
1773:
1720:Destinations from Simi Hills
224:
163:34.22444861°N 118.71675722°W
7:
1961:Woodland Hills, Los Angeles
1270:USA Today article USA Today
988:
945:Old Santa Susana Stage Road
849:the 1959 event than in the
314:lies to the north, and the
10:
1977:
851:Three Mile Island accident
707:
636:Toxicodendron diversilobum
472:
168:34.22444861; -118.71675722
97:location of Simi Hills in
61:2,139 ft (652 m)
1726:
1668:"Parks - LAMountains.com"
1612:"Parks - LAMountains.com"
1085:10.1007/s10040-014-1206-1
425:, 2,403 ft (732 m),
389:), Moore's Canyon Creek,
178:
139:
125:
117:
109:
70:
65:
55:
47:
42:
26:
21:
1946:Hidden Hills, California
1941:Agoura Hills, California
1402:http://www.nps.gov/juba/
995:Burro Flats Painted Cave
937:with trails and camping.
892:, western Simi Hills in
864:
753:Burro Flats Painted Cave
684:Agoura Hills, California
645:
517:
495:Santa Clara River Valley
416:
1956:West Hills, Los Angeles
908:West Hills, Los Angeles
902:and the Moore's Canyon
616:Plummer's mariposa lily
381:for several year-round
1830:Santa Monica Mountains
1821:Santa Monica Mountains
1283:"Mercury News article"
1240:public domain material
978:Santa Monica Mountains
973:Santa Susana Mountains
844:experiments with four
660:Santa Susana Mountains
656:Santa Monica Mountains
576:), and the scrub oak (
449:Oakbrook Regional Park
367:Santa Monica Mountains
359:Santa Susana Mountains
1475:access date: 6/6/2010
1463:access date: 6/6/2010
1451:access date: 6/6/2010
1374:. Accessed 10/23/2007
1251:National Park Service
764:National Park Service
747:, at the present day
682:at Liberty Canyon in
668:San Gabriel Mountains
620:Calochortus plummerae
608:redbush monkey flower
1181:The Associated Press
1064:Hydrogeology Journal
755:, an example of the
654:linking the coastal
640:native plant habitat
588:California sycamores
253:improve this article
1936:San Fernando Valley
1890:interactive website
1793:San Fernando Valley
1672:www.lamountains.com
1616:www.lamountains.com
1208:National Geographic
1076:2015HydJ...23..405C
1005:Rancho El Escorpión
927:complex with museum
917:adjacent and above
788:Rancho El Escorpión
729:Cañon del Escorpión
628:Encelia californica
612:Mimulus aurantiacus
507:San Fernando Valley
308:San Fernando Valley
159: /
1653:2010-02-07 at the
1389:2009-03-13 at the
1272:Accessed 2/22/2008
696:The population of
664:Topatopa Mountains
652:wildlife corridors
560:coastal live oak (
350:(to the west) and
301:Los Angeles County
211:Los Angeles County
43:Highest point
1911:Transverse Ranges
1849:
1848:
1844:
1843:
1743:Santa Susana Pass
1491:Los Angeles Times
1142:"Chatsworth Peak"
983:Verdugo Mountains
919:Santa Susana Pass
900:El Escorpión Park
877:; West Hills and
846:nuclear accidents
772:El Escorpión Park
718:Chumash-Venturaño
592:Platanus racemosa
563:Quercus agrifolia
403:Los Angeles River
363:Santa Susana Pass
289:Transverse Ranges
285:
284:
277:
203:Transverse Ranges
191:
190:
141:Range coordinates
1968:
1809:
1808:
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1783:
1776:
1775:
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1729:
1713:
1706:
1699:
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1429:
1423:
1417:
1411:
1405:
1399:
1393:
1381:
1375:
1369:
1367:
1366:
1357:. Archived from
1350:
1344:
1342:
1336:
1328:
1326:
1325:
1319:
1313:. Archived from
1312:
1304:
1298:
1297:
1295:
1293:
1279:
1273:
1267:
1261:
1260:
1258:
1257:
1237:
1236:
1231:
1225:
1224:
1222:
1220:
1215:on June 22, 2018
1211:. Archived from
1198:
1192:
1191:
1189:
1187:
1172:
1166:
1165:
1163:
1162:
1138:
1132:
1131:
1129:
1128:
1104:
1098:
1097:
1087:
1055:
1049:
1048:
1046:
1045:
1021:
871:Bell Canyon Park
796:Rancho El Conejo
766:administers the
749:Bell Canyon Park
721:Native Americans
698:red-legged frogs
658:with the inland
642:community here.
624:canyon sunflower
600:Salix lasiolepis
481:, mild winters.
462:
444:
399:Arroyo Calabasas
352:Simi Valley city
344:Westlake Village
338:. The cities of
332:Los Angeles city
280:
273:
269:
266:
260:
237:
229:
197:are a low rocky
174:
173:
171:
170:
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87:
86:
80:
31:
19:
18:
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1655:Wayback Machine
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1308:"Archived copy"
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1287:mercurynews.com
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964:
931:Sage Ranch Park
913:Rocky Peak Park
884:Challenger Park
867:
842:nuclear reactor
710:
680:Ventura Freeway
648:
586:plants include
556:) include: the
520:
515:
513:Flora and fauna
503:Conejo Mountain
475:
470:
469:
468:
467:
466:
463:
454:
453:
452:
445:
427:Chatsworth Peak
419:
375:
299:within western
281:
270:
264:
261:
250:
238:
227:
187: Calabasas
167:
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88:
38:
17:
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11:
5:
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1963:
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1853:External links
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960:
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948:
938:
928:
922:
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897:
894:Ventura County
886:
881:
866:
863:
824:Ahmanson Ranch
817:, and west of
782:. In 1845 the
745:Escorpión Peak
709:
706:
647:
644:
596:arroyo willows
579:Quercus dumosa
573:Quercus lobata
519:
516:
514:
511:
474:
471:
464:
457:
456:
455:
446:
439:
438:
437:
436:
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431:Escorpión Peak
418:
415:
374:
371:
328:Woodland Hills
293:Ventura County
283:
282:
241:
239:
232:
226:
223:
213:, of southern
207:Ventura County
199:mountain range
189:
188:
182:
176:
175:
154:118°43′0.326″W
151:34°13′28.015″N
143:
137:
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130:Ventura County
127:
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107:
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33:Main ridge of
32:
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15:
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1817:Thousand Oaks
1815:
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1804:
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1770:
1768:
1767:Thousand Oaks
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1392:
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1373:
1361:on 2009-03-13
1360:
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1334:
1320:on 2010-03-14
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962:Nearby ranges
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825:
820:
816:
815:Thousand Oaks
812:
808:
804:
803:movie ranches
799:
797:
793:
789:
785:
781:
780:Conejo Valley
777:
773:
769:
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759:, is nearby.
758:
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714:Paleo-indians
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633:
629:
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621:
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609:
605:
601:
597:
593:
589:
585:
584:Riparian zone
581:
580:
575:
574:
569:
565:
564:
559:
555:
551:
547:
544:
540:
539:oak woodlands
536:
533:
529:
525:
510:
508:
504:
500:
499:Conejo Valley
496:
492:
488:
484:
480:
461:
450:
443:
434:
432:
428:
424:
414:
412:
408:
404:
400:
396:
392:
388:
384:
380:
370:
368:
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360:
355:
353:
349:
348:Thousand Oaks
345:
341:
337:
333:
329:
325:
321:
317:
316:Conejo Valley
313:
309:
304:
302:
298:
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279:
276:
268:
258:
254:
248:
247:
242:This section
240:
236:
231:
230:
222:
220:
219:United States
216:
212:
208:
204:
200:
196:
186:
183:
181:
177:
172:
144:
142:
138:
135:
131:
128:
124:
120:
116:
113:United States
112:
108:
100:
79:
69:
64:
60:
58:
54:
50:
46:
41:
36:
30:
25:
20:
1889:
1880:Park finders
1835:Hidden Hills
1826:Agoura Hills
1777:
1719:
1675:. Retrieved
1671:
1662:
1643:
1631:
1619:. Retrieved
1615:
1606:
1594:
1582:
1570:
1558:
1546:
1535:
1523:
1511:
1499:
1490:
1480:
1468:
1456:
1444:
1433:
1421:
1409:
1397:
1379:
1363:. Retrieved
1359:the original
1348:
1322:. Retrieved
1315:the original
1302:
1290:. Retrieved
1286:
1277:
1265:
1254:. Retrieved
1245:
1229:
1217:. Retrieved
1213:the original
1206:
1196:
1184:. Retrieved
1170:
1159:. Retrieved
1145:
1136:
1125:. Retrieved
1111:
1102:
1067:
1063:
1053:
1042:. Retrieved
1028:
1025:"Simi Hills"
1019:
916:
856:
832:
800:
761:
728:
724:
711:
702:Woolsey Fire
695:
688:
649:
635:
627:
619:
611:
606:include the
599:
591:
577:
571:
570:valley oak (
561:
554:Quercus spp.
553:
521:
491:Oxnard Plain
476:
420:
387:Malibu Creek
376:
356:
340:Agoura Hills
305:
286:
271:
265:January 2021
262:
251:Please help
246:verification
243:
209:and western
194:
192:
1738:Simi Valley
1108:"Simi Peak"
968:Chalk Hills
943:- with the
933:- near the
879:Bell Canyon
819:Simi Valley
807:Bell Canyon
604:wildflowers
411:Canoga Park
395:Arroyo Simi
312:Simi Valley
205:in eastern
166: /
134:Los Angeles
1906:Simi Hills
1900:Categories
1797:West Hills
1789:Chatsworth
1778:Simi Hills
1747:Rocky Peak
1365:2010-03-24
1324:2010-03-23
1256:2021-07-12
1161:2009-05-03
1127:2009-05-03
1070:(2): 406.
1044:2009-05-03
1011:References
1000:Bell Creek
875:Bell Creek
835:Rocketdyne
813:, east of
784:land grant
741:Bell Creek
632:poison oak
602:). Spring
524:grasslands
409:in nearby
407:confluence
391:Bell Creek
379:watersheds
373:Watersheds
365:; and the
324:West Hills
320:Chatsworth
215:California
195:Simi Hills
121:California
99:California
91:Simi Hills
22:Simi Hills
1839:Calabasas
1094:129607293
906:segment;
568:deciduous
558:evergreen
546:ecoregion
535:shrubland
532:chaparral
487:wildfires
423:Simi Peak
297:foothills
225:Geography
126:Districts
66:Geography
57:Elevation
51:Simi Peak
35:Simi Peak
1733:Moorpark
1651:Archived
1387:Archived
1333:cite web
989:See also
811:U.S. 101
792:Pío Pico
737:Tataviam
497:and the
180:Topo map
1677:9 April
1621:9 April
1372:website
1292:9 April
1219:21 June
1186:21 June
1072:Bibcode
708:History
672:habitat
622:), and
566:), the
473:Climate
201:of the
110:Country
1092:
794:. The
743:below
735:, and
733:Tongva
725:Hu'wam
666:, and
594:) and
548:. The
383:creeks
336:county
326:, and
310:. The
1858:Parks
1318:(PDF)
1311:(PDF)
1242:from
1090:S2CID
873:with
865:Parks
646:Fauna
518:Flora
479:rainy
417:Peaks
118:State
1679:2018
1623:2018
1339:link
1294:2018
1221:2018
1188:2018
857:The
786:for
716:and
550:oaks
537:and
526:and
483:Snow
342:and
334:and
193:The
185:USGS
132:and
48:Peak
1080:doi
727:in
686:.
630:).
614:),
582:).
528:oak
255:by
1902::
1888:—
1670:.
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263:(
249:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
