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Mount Sylvania

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Extinct volcano near Portland, Oregon, United States
1967: 269:National Oceanic and Atmospheric Administration 1950: 421: 236:is located on the mountain's western slopes. 1957: 1943: 428: 414: 340:: CS1 maint: location missing publisher ( 356:"The Boring Lava Field, Portland, Oregon" 2026:Multnomah County, Oregon geography stubs 399:United States Department of the Interior 315: 435: 309: 1968: 1694:John Day Fossil Beds National Monument 2021:Landforms of Multnomah County, Oregon 2016:Mountains of Clackamas County, Oregon 2011:Shield volcanoes of the United States 2001:Volcanoes of Clackamas County, Oregon 1996:Volcanoes of Multnomah County, Oregon 1654:Fort Rock-Christmas Lake Valley Basin 409: 251: 249: 1905: 273:United States Department of Commerce 390:Geographic Names Information System 13: 320:(7th ed.). Portland, Oregon. 246: 14: 2037: 377: 1909: 27: 395:United States Geological Survey 118:Derived from Silvanus, a Roman 348: 285: 1: 239: 92:45.438174217°N 122.72164825°W 1929:. You can help Knowledge by 1925:state location article is a 1706:Lava Butte (Basin and Range) 1626:Devils Garden Volcanic Field 1502:Lava Butte (Newberry/Tumalo) 1421:Willamette National Cemetery 922:Sand Mountain Volcanic Field 7: 1797:Columbia River Basalt Group 1679:Harney Basin Volcanic Field 1378:Southern Oregon Coast Range 1023:Tom Dick and Harry Mountain 316:McArthur, Lewis A. (2003). 97:45.438174217; -122.72164825 10: 2042: 1904: 1522:Oregon Badlands Wilderness 1411:Upper and Lower Table Rock 696:Little Chinquapin Mountain 234:Portland Community College 1874:Cobb-Eickelberg Seamounts 1850: 1782: 1591: 1429: 1092: 554:Davis Lake Volcanic Field 447: 192: 180: 175: 162: 148: 130: 125: 112: 107: 68: 58: 43: 38: 33:Top as seen from Tualatin 26: 21: 1570:Wildcat Mountain Caldera 293:"Mount Sylvania, Oregon" 265:National Geodetic Survey 64:510 ft (155 m) 49:978 ft (298 m) 1884:Devils Elbow State Park 1832:Saddle Mountains Basalt 1659:Four Craters Lava Field 1283:Mount Scott (Clackamas) 318:Oregon Geographic Names 232:The Sylvania campus of 1749:Squaw Ridge Lava Field 1739:Powder River Volcanics 1735:Powder River Volcanics 1368:Siletz River Volcanics 1242:Little Butte Volcanics 1048:Tumalo Volcanic Center 710:Lost Lake Cinder Cones 217:, on the outskirts of 1557:Smith Rock State Park 1467:Crooked River Caldera 1444:Bald Mountain Caldera 807:Mount Scott (Klamath) 692:Little Cache Mountain 1986:Subduction volcanoes 1764:Strawberry Volcanics 1313:Oregon's Matterhorns 867:Pine Marten Mountain 841:Oregon's Matterhorns 2006:Lake Oswego, Oregon 1981:Mountains of Oregon 1976:Volcanoes of Oregon 1869:Brown Bear Seamount 1817:Hat Rock State Park 1802:Grande Ronde Basalt 1759:Strawberry Mountain 1472:Deschutes Formation 1074:Williamson Mountain 990:Three Fingered Jack 959:South Pinhead Butte 829:North Pinhead Butte 545:Cupit Mary Mountain 513:Chinquapin Mountain 88: /  1856:Juan de Fuca Ridge 1684:Hole-in-the-Ground 1561:Tea Table Mountain 1401:Tualatin Mountains 1098:Oregon Coast Range 1067:West Pinhead Butte 700:Little Nash Crater 677:Little Aspen Butte 157:Tualatin Mountains 52: NAVD 88 39:Highest point 1991:Cascade Volcanoes 1938: 1937: 1902: 1901: 1710:Mahogany Mountain 1487:Gearhart Mountain 1246:Little Pilot Rock 1156:Crescent Mountain 1131:Boring Lava Field 942:Sheridan Mountain 608:Greylock Mountain 215:Boring Lava Field 204: 203: 199:Boring Lava Field 54: 2033: 1959: 1952: 1945: 1919:Multnomah County 1913: 1906: 1784:Columbia Plateau 1725:Mutton Mountains 1565:Wildcat Mountain 1517:Ochoco Mountains 1512:Newberry Volcano 1497:Grizzly Mountain 1431:Eastern Cascades 1141:Chamberlain Hill 1094:Western Cascades 850:Peavine Mountain 817:Mount Washington 793:Mount McLoughlin 739:Maklaks Mountain 720:Lookout Mountain 643:Howlock Mountain 596:Frog Lake Buttes 517:Clear Lake Butte 430: 423: 416: 407: 406: 402: 385:"Mount Sylvania" 371: 370: 368: 367: 352: 346: 345: 339: 331: 313: 307: 306: 304: 303: 289: 283: 282: 280: 279: 257:"Sylvania Reset" 253: 219:Portland, Oregon 152: 135:Multnomah County 103: 102: 100: 99: 98: 93: 89: 86: 85: 84: 81: 50: 31: 19: 18: 2041: 2040: 2036: 2035: 2034: 2032: 2031: 2030: 1966: 1965: 1964: 1963: 1903: 1898: 1846: 1827:Pendleton Vents 1822:Hermiston Butte 1778: 1754:Steens Mountain 1732:Poker Jim Ridge 1729:Pillars of Rome 1634:Diamond Craters 1630:Dooley Mountain 1593:Basin and Range 1587: 1583:Yamsay Mountain 1425: 1358:Saddle Mountain 1323:Pepper Mountain 1254:Lost Lake Butte 1232:Laurel Mountain 1213:Indian Mountain 1194:Harter Mountain 1179:Elk Rock Island 1088: 1084:Zigzag Mountain 1043:Tumalo Mountain 798:Mount Multnomah 783:Mount Jefferson 663:Le Conte Crater 531:Crater Mountain 443: 434: 383: 380: 375: 374: 365: 363: 354: 353: 349: 333: 332: 328: 314: 310: 301: 299: 291: 290: 286: 277: 275: 255: 254: 247: 242: 150: 96: 94: 90: 87: 82: 79: 77: 75: 74: 34: 17: 12: 11: 5: 2039: 2029: 2028: 2023: 2018: 2013: 2008: 2003: 1998: 1993: 1988: 1983: 1978: 1962: 1961: 1954: 1947: 1939: 1936: 1935: 1914: 1900: 1899: 1897: 1896: 1891: 1886: 1881: 1876: 1871: 1866: 1864:Axial Seamount 1860: 1858: 1848: 1847: 1845: 1844: 1842:Wanapum Basalt 1839: 1834: 1829: 1824: 1819: 1814: 1809: 1804: 1799: 1794: 1788: 1786: 1780: 1779: 1777: 1776: 1771: 1769:Tower Mountain 1766: 1761: 1756: 1751: 1746: 1741: 1736: 1733: 1730: 1727: 1722: 1717: 1712: 1707: 1704: 1701: 1699:Jordan Craters 1696: 1691: 1686: 1681: 1676: 1671: 1669:Hager Mountain 1666: 1661: 1656: 1651: 1646: 1641: 1636: 1631: 1628: 1623: 1618: 1615: 1612: 1607: 1601: 1599: 1597:Eastern Oregon 1589: 1588: 1586: 1585: 1580: 1577: 1572: 1567: 1562: 1559: 1554: 1549: 1544: 1539: 1534: 1529: 1524: 1519: 1514: 1509: 1504: 1499: 1494: 1489: 1484: 1479: 1477:Hager Mountain 1474: 1469: 1464: 1459: 1454: 1451: 1446: 1441: 1435: 1433: 1427: 1426: 1424: 1423: 1418: 1413: 1408: 1403: 1398: 1396:Three Pyramids 1393: 1388: 1385: 1380: 1375: 1370: 1365: 1360: 1355: 1350: 1345: 1340: 1335: 1330: 1325: 1320: 1315: 1310: 1308:Olson Mountain 1305: 1300: 1295: 1290: 1288:Mount Sylvania 1285: 1280: 1275: 1270: 1268:Mount Defiance 1265: 1260: 1255: 1252: 1247: 1244: 1239: 1234: 1229: 1227:Larch Mountain 1224: 1219: 1214: 1211: 1209:Hunsinger Peak 1206: 1201: 1199:Highland Butte 1196: 1191: 1186: 1184:Grass Mountain 1181: 1176: 1171: 1168: 1163: 1158: 1153: 1148: 1143: 1138: 1133: 1128: 1123: 1118: 1113: 1108: 1102: 1100: 1090: 1089: 1087: 1086: 1081: 1076: 1071: 1070:Whiteface Peak 1068: 1065: 1063:Waldo Mountain 1060: 1055: 1050: 1045: 1040: 1035: 1030: 1025: 1020: 1015: 1013:Three Trappers 1010: 992: 987: 984: 981: 976: 973: 968: 963: 960: 957: 952: 949: 944: 939: 934: 929: 924: 919: 914: 909: 907:Royce Mountain 904: 899: 896: 895:Robinson Butte 893: 888: 883: 878: 875: 872: 869: 864: 863:Pinhead Buttes 861: 856: 851: 848: 843: 838: 833: 830: 827: 822: 819: 814: 812:Mount Thielsen 809: 804: 801: 795: 790: 785: 780: 775: 773:Mount Harriman 770: 765: 760: 758:Mount Bachelor 755: 750: 745: 740: 737: 735:Maklaks Crater 732: 727: 722: 717: 712: 707: 702: 697: 694: 689: 687:Little Brother 684: 682:Little Belknap 679: 674: 669: 664: 661: 658: 653: 648: 647:Irish Mountain 645: 640: 635: 630: 625: 620: 615: 610: 605: 600: 597: 594: 591: 589:Forgotten Cone 586: 581: 576: 571: 566: 561: 559:Davis Mountain 556: 551: 546: 543: 538: 533: 528: 523: 518: 515: 510: 508:Cache Mountain 505: 504:Buckskin Butte 502: 497: 492: 487: 485:Belknap Crater 482: 477: 474: 469: 464: 459: 457:Applegate Peak 453: 451: 445: 444: 433: 432: 425: 418: 410: 404: 403: 379: 378:External links 376: 373: 372: 347: 326: 308: 297:Peakbagger.com 284: 261:NGS Data Sheet 244: 243: 241: 238: 213:, part of the 209:is an extinct 207:Mount Sylvania 202: 201: 196: 194:Volcanic field 190: 189: 187:Shield volcano 184: 178: 177: 173: 172: 166: 160: 159: 154: 146: 145: 132: 128: 127: 123: 122: 120:tutelary deity 116: 110: 109: 105: 104: 72: 66: 65: 62: 56: 55: 47: 41: 40: 36: 35: 32: 24: 23: 22:Mount Sylvania 15: 9: 6: 4: 3: 2: 2038: 2027: 2024: 2022: 2019: 2017: 2014: 2012: 2009: 2007: 2004: 2002: 1999: 1997: 1994: 1992: 1989: 1987: 1984: 1982: 1979: 1977: 1974: 1973: 1971: 1960: 1955: 1953: 1948: 1946: 1941: 1940: 1934: 1932: 1928: 1924: 1920: 1915: 1912: 1908: 1907: 1895: 1892: 1890: 1887: 1885: 1882: 1880: 1877: 1875: 1872: 1870: 1867: 1865: 1862: 1861: 1859: 1857: 1853: 1852:Pacific Coast 1849: 1843: 1840: 1838: 1837:Steens Basalt 1835: 1833: 1830: 1828: 1825: 1823: 1820: 1818: 1815: 1813: 1812:Imnaha Basalt 1810: 1808: 1805: 1803: 1800: 1798: 1795: 1793: 1790: 1789: 1787: 1785: 1781: 1775: 1772: 1770: 1767: 1765: 1762: 1760: 1757: 1755: 1752: 1750: 1747: 1745: 1742: 1740: 1737: 1734: 1731: 1728: 1726: 1723: 1721: 1720:Modoc Plateau 1718: 1716: 1715:Malheur Butte 1713: 1711: 1708: 1705: 1703:Lambert Rocks 1702: 1700: 1697: 1695: 1692: 1690: 1689:Jackies Butte 1687: 1685: 1682: 1680: 1677: 1675: 1672: 1670: 1667: 1665: 1662: 1660: 1657: 1655: 1652: 1650: 1647: 1645: 1642: 1640: 1639:Doherty Slide 1637: 1635: 1632: 1629: 1627: 1624: 1622: 1619: 1616: 1613: 1611: 1608: 1606: 1603: 1602: 1600: 1598: 1594: 1590: 1584: 1581: 1578: 1576: 1573: 1571: 1568: 1566: 1563: 1560: 1558: 1555: 1553: 1550: 1548: 1545: 1543: 1542:Powell Buttes 1540: 1538: 1537:Pine Mountain 1535: 1533: 1530: 1528: 1525: 1523: 1520: 1518: 1515: 1513: 1510: 1508: 1505: 1503: 1500: 1498: 1495: 1493: 1490: 1488: 1485: 1483: 1480: 1478: 1475: 1473: 1470: 1468: 1465: 1463: 1460: 1458: 1455: 1452: 1450: 1447: 1445: 1442: 1440: 1439:Bald Mountain 1437: 1436: 1434: 1432: 1428: 1422: 1419: 1417: 1414: 1412: 1409: 1407: 1404: 1402: 1399: 1397: 1394: 1392: 1389: 1387:Sunshine Rock 1386: 1384: 1383:Spencer Butte 1381: 1379: 1376: 1374: 1371: 1369: 1366: 1364: 1361: 1359: 1356: 1354: 1353:Roxy Ann Peak 1351: 1349: 1348:Ross Mountain 1346: 1344: 1341: 1339: 1336: 1334: 1331: 1329: 1326: 1324: 1321: 1319: 1316: 1314: 1311: 1309: 1306: 1304: 1303:Nesmith Point 1301: 1299: 1298:Mount Talbert 1296: 1294: 1291: 1289: 1286: 1284: 1281: 1279: 1276: 1274: 1271: 1269: 1266: 1264: 1263:Mount Ashland 1261: 1259: 1256: 1253: 1251: 1250:Lookout Point 1248: 1245: 1243: 1240: 1238: 1237:Lenhart Butte 1235: 1233: 1230: 1228: 1225: 1223: 1220: 1218: 1217:Iron Mountain 1215: 1212: 1210: 1207: 1205: 1202: 1200: 1197: 1195: 1192: 1190: 1187: 1185: 1182: 1180: 1177: 1175: 1172: 1170:French's Dome 1169: 1167: 1164: 1162: 1159: 1157: 1154: 1152: 1149: 1147: 1146:Clatsop Butte 1144: 1142: 1139: 1137: 1134: 1132: 1129: 1127: 1126:Bone Mountain 1124: 1122: 1119: 1117: 1114: 1112: 1109: 1107: 1104: 1103: 1101: 1099: 1095: 1091: 1085: 1082: 1080: 1079:Wizard Island 1077: 1075: 1072: 1069: 1066: 1064: 1061: 1059: 1056: 1054: 1051: 1049: 1046: 1044: 1041: 1039: 1038:Triangle Peak 1036: 1034: 1033:Triangle Hill 1031: 1029: 1026: 1024: 1021: 1019: 1018:Timber Crater 1016: 1014: 1011: 1008: 1004: 1003:Middle Sister 1000: 996: 995:Three Sisters 993: 991: 988: 985: 982: 980: 977: 974: 972: 971:Teardrop Pool 969: 967: 966:Talapus Butte 964: 961: 958: 956: 955:South Belknap 953: 950: 948: 945: 943: 940: 938: 935: 933: 932:Sentinel Rock 930: 928: 925: 923: 920: 918: 917:Sand Mountain 915: 913: 910: 908: 905: 903: 900: 897: 894: 892: 889: 887: 884: 882: 879: 876: 873: 871:Pothole Butte 870: 868: 865: 862: 860: 857: 855: 854:Pelican Butte 852: 849: 847: 846:Olallie Butte 844: 842: 839: 837: 834: 831: 828: 826: 823: 820: 818: 815: 813: 810: 808: 805: 802: 800:(unconfirmed) 799: 796: 794: 791: 789: 786: 784: 781: 779: 776: 774: 771: 769: 768:Mount Carmine 766: 764: 761: 759: 756: 754: 753:Merriam Point 751: 749: 746: 744: 741: 738: 736: 733: 731: 728: 726: 723: 721: 718: 716: 715:Lookout Butte 713: 711: 708: 706: 703: 701: 698: 695: 693: 690: 688: 685: 683: 680: 678: 675: 673: 670: 668: 665: 662: 659: 657: 654: 652: 649: 646: 644: 641: 639: 636: 634: 631: 629: 626: 624: 623:Hayrick Butte 621: 619: 616: 614: 611: 609: 606: 604: 603:Garfield Peak 601: 599:Fuji Mountain 598: 595: 592: 590: 587: 585: 582: 580: 577: 575: 572: 570: 567: 565: 562: 560: 557: 555: 552: 550: 547: 544: 542: 539: 537: 534: 532: 529: 527: 524: 522: 519: 516: 514: 511: 509: 506: 503: 501: 498: 496: 493: 491: 488: 486: 483: 481: 478: 475: 473: 470: 468: 465: 463: 460: 458: 455: 454: 452: 450: 449:High Cascades 446: 442: 438: 431: 426: 424: 419: 417: 412: 411: 408: 400: 396: 392: 391: 386: 382: 381: 362:on 2011-07-01 361: 357: 351: 343: 337: 329: 327:0-87595-277-1 323: 319: 312: 298: 294: 288: 274: 270: 266: 262: 258: 252: 250: 245: 237: 235: 230: 228: 224: 220: 216: 212: 208: 200: 197: 195: 191: 188: 185: 183: 182:Mountain type 179: 174: 170: 167: 165: 161: 158: 155: 153: 147: 144: 140: 136: 133: 129: 124: 121: 117: 115: 111: 106: 101: 73: 71: 67: 63: 61: 57: 53: 48: 46: 42: 37: 30: 25: 20: 1931:expanding it 1916: 1894:Yaquina Head 1879:Devils Elbow 1744:Saddle Butte 1674:Harney Basin 1664:Glass Buttes 1617:Clarks Butte 1579:Yainax Ridge 1575:Yainax Butte 1527:Paulina Peak 1462:Cline Buttes 1453:Bly Mountain 1449:Barnes Butte 1333:Powell Butte 1287: 1278:Mount Pisgah 1204:High Prairie 1189:Grizzly Peak 1161:Devil's Rest 1151:Cook's Butte 1136:Cascade Head 1053:Twin Craters 1028:Tot Mountain 1007:South Sister 999:North Sister 979:The Pinnacle 962:Summit Butte 912:Rustler Peak 859:Phantom Ship 832:North Wilson 821:Mount Wilson 788:Mount Mazama 763:Mount Bailey 748:Merriam Cone 743:Melvin Butte 725:Lumrum Butte 660:Lemiti Butte 651:Katsuk Butte 638:Hoodoo Butte 628:Hillman Peak 618:Hamner Butte 579:Dutton Cliff 569:Diamond Peak 541:Cryder Butte 495:Black Crater 476:Barlow Butte 388: 364:. Retrieved 360:the original 350: 317: 311: 300:. Retrieved 296: 287: 276:. Retrieved 260: 231: 206: 205: 151:Parent range 1889:Heceta Head 1774:Warner Peak 1621:Clarno Unit 1614:Chalk Basin 1610:Black Hills 1547:Round Butte 1532:Pilot Butte 1482:Horse Ridge 1416:Walker Peak 1343:Rogers Peak 1338:Rocky Butte 1318:Palmer Peak 1293:Mount Tabor 1222:Kelly Butte 1166:East Buttes 1111:Armet Creek 1106:Angels Rest 975:The Husband 891:Ringo Butte 836:Odell Butte 825:Nash Crater 730:Maiden Peak 705:Lolah Butte 656:Kwolh Butte 613:Grouse Hill 564:Desert Cone 536:Crater Peak 526:Crater Lake 490:Black Butte 467:Bald Crater 462:Aspen Butte 223:Lake Oswego 171:Lake Oswego 95: / 83:122°43′18″W 70:Coordinates 1970:Categories 1644:Drake Peak 1552:Smith Rock 1507:Monkeyface 1492:Gray Butte 1391:Swede Hill 1363:Scout Camp 1328:Pilot Rock 1273:Mount Hebo 1258:Marys Peak 1058:Union Peak 951:Sisi Butte 947:Siah Butte 937:Sharp Peak 927:Scout Hill 898:Rock Butte 886:Red Crater 778:Mount Hood 593:Fort Butte 549:Danger Bay 500:Broken Top 480:Bear Butte 472:Ball Butte 366:2008-04-01 302:2016-04-27 278:2008-11-17 240:References 80:45°26′17″N 60:Prominence 1792:Boat Rock 1649:Fort Rock 1457:China Hat 1373:Snow Peak 1174:Elk Point 1121:Battle Ax 983:The Twins 902:Rock Mesa 803:Mount Ray 672:Llao Rock 633:Hogg Rock 584:Egan Cone 574:Dry Butte 521:Cleetwood 437:Volcanoes 336:cite book 126:Geography 114:Etymology 45:Elevation 1807:Hat Rock 1605:Big Hole 986:The Wife 881:Red Cone 874:Redcloud 667:Llao Bay 164:Topo map 131:Location 1406:TV Hill 877:Red Box 211:volcano 176:Geology 1923:Oregon 1854:& 1595:& 1096:& 441:Oregon 324:  227:Tigard 225:, and 139:Oregon 108:Naming 1917:This 1116:Baldy 1927:stub 342:link 322:ISBN 169:USGS 143:U.S. 439:of 1972:: 1921:, 1005:, 1001:, 397:, 393:. 387:. 338:}} 334:{{ 295:. 271:, 267:, 263:. 259:. 248:^ 229:. 141:, 137:, 1958:e 1951:t 1944:v 1933:. 1009:) 997:( 429:e 422:t 415:v 401:. 369:. 344:) 330:. 305:. 281:.

Index


Elevation
 NAVD 88
Prominence
Coordinates
45°26′17″N 122°43′18″W / 45.438174217°N 122.72164825°W / 45.438174217; -122.72164825
Etymology
tutelary deity
Multnomah County
Oregon
U.S.
Parent range
Tualatin Mountains
Topo map
USGS
Mountain type
Shield volcano
Volcanic field
Boring Lava Field
volcano
Boring Lava Field
Portland, Oregon
Lake Oswego
Tigard
Portland Community College


"Sylvania Reset"
National Geodetic Survey
National Oceanic and Atmospheric Administration

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