Lassen Volcanic National Park

thumb|upright=1.3|Map of Lassen Volcanic National park

thumb|[[Mount Shasta from Lassen Peak]]

thumb|upright|Painted Dunes and Fantastic Lava Beds as seen from the edge of [[Cinder Cone and the Fantastic Lava Beds|Cinder Cone's crater.]]

Lassen Volcanic National Park is a national park of the United States in northeastern California. The dominant feature of the park is Lassen Peak, the largest plug dome volcano in the world and the southernmost volcano in the Cascade Range. Lassen Volcanic National Park is one of the few areas in the world where all four types of volcanoes can be found: plug dome, shield, cinder cone, and stratovolcano.

The source of heat for the volcanism in the Lassen area is subduction of the Gorda plate diving below the North American plate off the Northern California coast. The area surrounding Lassen Peak is still active with boiling mud pots, fumaroles, and hot springs.

Lassen Volcanic National Park started as two separate national monuments designated by President Theodore Roosevelt in 1907: Cinder Cone National Monument and Lassen Peak National Monument. Starting in May 1914 and lasting until 1917, a series of minor to major eruptions occurred on Lassen. Because of the eruptive activity and the area's stark volcanic beauty, Lassen Peak, Cinder Cone, and the area surrounding were established as a National Park on August 9, 1916.

European immigrants in the mid-19th century used Lassen Peak as a landmark on their trek to the fertile Sacramento Valley. One of the guides to these immigrants was a Danish blacksmith named Peter Lassen, who settled in Northern California in the 1830s. Lassen Peak was named after him.

Starting in May 1914 and lasting until 1921, a series of minor to major eruptions occurred on Lassen. These events created a new crater, and released lava and a great deal of ash. Fortunately, because of warnings, no one was killed, but several houses along area creeks were destroyed. Because of the eruptive activity, which continued through 1917, and the area's stark volcanic beauty, Lassen Peak, Cinder Cone and the area surrounding were declared a National Park on August 9, 1916.

In 1974, the National Park Service took the advice of the USGS and closed the visitor center and accommodations at Manzanita Lake. The Survey stated that these buildings would be in the way of a rockslide from Chaos Crags if an earthquake or eruption occurred in the area. Should indications of a significant increase in volcanic activity be detected, the USGS will immediately deploy scientists and specially designed portable monitoring instruments to evaluate the threat. In addition, the National Park Service (NPS) has developed an emergency response plan that would be activated to protect the public in the event of an impending eruption.

A downhill skiing site operating in the area was closed in 1992. The last remaining part was the Lassen Chalet, located near the southwest entrance, which was finally demolished in 2005. It was so named after the Mountain Maidu name for Lassen Peak. On August 5, 2021, the fire entered Lassen Volcanic National Park near Juniper Lake and the entire park was closed for safety. The town of Mineral, including park headquarters, was forced to evacuate. Structure loss occurred at the Drakesbad Guest Ranch and at cabins near Juniper Lake. The Dixie Fire's advance northward was slowed by the 2012 Reading Fire footprint, but the Dixie Fire ultimately burned 73,240 acres within the park—approximately 69% of the park's total area. 12,845 acres, or 18% of that area, burned at a severity that left the landscape unchanged. 34,450 acres, or 49% of the burned area in the park, burned at a low-to-moderate severity. The remaining 23,493 acres, or 33% of the area burned by the Dixie Fire in Lassen Volcanic National Park, burned at a high severity.

Visitation

The NPS tracks visitors to Lassen by using in-road inductive loops at all vehicle entrances which count passing vehicles. Buses and other non-reportable vehicles are subtracted from the vehicle count, which is then multiplied by three, an estimate of the number of visitors per vehicle.

{| class="wikitable" style="border:1px black;"

! colspan="2"|Visitation By Year

! Year

! Recreational visitors

| 2000

| 374,911

| 2001

| 376,695

| 2002

| 388,149

| 2003

| 404,384

| 2004

| 379,667

| 2005

| 365,535

| 2006

| 388,741

| 2007

| 395,057

| 2008

| 377,361

| 2009

| 365,639

| 2010

| 384,570

| 2011

| 351,269

| 2012

| 407,653

| 2013

| 427,409

| 2014

| 432,977

| 2015

| 468,092

| 2016

| 536,068

| 2017

| 507,256

| 2018

| 499,435

| 2019

| 517,039

| 2020

| 542,274

| 2021

| 359,635

|2022

|446,291

|2023

|418,978

|2024

|357,651

|2025

|407,653

Geography and geology

thumb|upright=1.35|Map of Lassen area showing hydrothermal features (red dots) and volcanic features or remnants (yellow cones). Also shown is the outline of Brokeoff Volcano (Mount Tehama).

The park is located near the northern end of the Sacramento Valley, near the cities of Redding and Susanville. It is located in portions of Shasta, Lassen, Plumas, and Tehama counties.

The western part of the park features great lava pinnacles (huge mountains created by lava flows), jagged craters, and steaming sulfur vents. It is cut by glaciated canyons and is dotted and threaded by lakes and rushing clear streams.

The eastern part of the park is a vast lava plateau more than one mile (1.6 km) above sea level. Here, small cinder cones are found (Fairfield Peak, Hat Mountain, and Crater Butte). Forested with pine and fir, this area is studded with small lakes, but it boasts few streams. Warner Valley, marking the southern edge of the Lassen Plateau, features hot spring areas (Boiling Springs Lake, Devils Kitchen, and Terminal Geyser). an igneous rock, and is one of the world's largest plug dome volcanoes. It is also the southernmost non-extinct volcano of the Cascade Range (specifically, the Shasta Cascade part of the range). The tall volcano sits on the north-east flank of the remains of Mount Tehama, a stratovolcano that was a thousand feet (305 m) higher than Lassen and wide at its base.

Access

The park is accessible via State Routes 89 and 44. SR 89 passes north–south through the park, beginning at SR 36 to the south and ending at SR 44 to the north. SR 89 passes immediately adjacent to the base of Lassen Peak. There are five vehicle entrances to the park: the north and south entrances on SR 89; and unpaved roads entering at Drakesbad and Juniper Lake in the south, and at Butte Lake in the northeast. The park can also be accessed by trails leading in from the Caribou Wilderness to the east, as well as the Pacific Crest Trail, and two smaller trails leading in from Willow Lake and Little Willow Lake to the south.

The segment of SR 89 through the park is typically closed during the winter due to very heavy snowfall and snowpack.

Climate

According to the Köppen climate classification system, Lassen Volcanic National Park has a Mediterranean-influenced warm-summer Humid continental climate (Dsb). According to the United States Department of Agriculture, the Plant Hardiness zone at Kohm Yah-mah-nee Visitor Center at elevation is 6b with an average annual extreme minimum temperature of .

Since the entire park is located at medium to high elevations, the park generally has cool-cold winters and warm summers below . Above this elevation, the climate is harsh and cold, with cool summer temperatures. Precipitation within the park is high to very high due to a lack of a rain shadow from the Coast Ranges. The park gets more precipitation than anywhere else in the Cascades south of the Three Sisters. Snowfall at the new visitor center near the southwest entrance at is around despite facing east. Up around Lake Helen, at the snowfall is around , making it probably the snowiest place in California. In addition, Lake Helen gets more average snow accumulation than any other recording station located near a volcano in the Cascade range, with a maximum of . Snowbanks persist year-round.

Plants

According to the A. W. Kuchler U.S. Potential natural vegetation Types, Lassen Volcanic National Park has a red fir, Abies magnifica (7) potential vegetation type with a California Conifer Forest (2) potential vegetation form.

Lying at the northern end of the Sierra Nevada forests ecoregion, Lassen Volcanic National Park preserves a landscape nearly as it existed before Euro-American settlement: its of old growth include all of its major forest types.

At elevations below 6,500 feet the dominant vegetation community is the mixed conifer forest. ponderosa and Jeffrey pines, sugar pine, and white fir form the forest canopy for this rich community that also includes species of manzanita, gooseberry, and Ceanothus. Common wildflowers include iris, spotted coralroot, pyrola, violets, and lupin.

Above the mixed-conifer forest is the major community of the red fir forest. Between elevations of 6,500 and 8,000 feet, red fir, western white pine, mountain hemlock, and lodgepole pine dominate a community less diverse than the mixed-conifer forest. Common plants include satin lupine, woolly mule's-ears and pinemat manzanita. Areas such as Reflection Lake attract waterfowl, including Canada geese, great blue heron, snowy egret, and kingfisher.

Lassen Volcanic Park is home to the Sierra Nevada red fox in particular, one of the rarest mammals in California. 20 individuals have been identified in the park, making it the largest known Sierra Nevada red fox population.

A repopulation of wolves in California began in late December 2011. A northwestern wolf pack originally from Oregon known as the Lassen Pack inhabits the forest surrounding this national park. Other residential California wolves are the Beckwourth and Whaleback packs. The Shasta pack, which formerly was in the forest near this park, no longer appears to be extant. In 2024, a pack consisting of a breeding pair and at least one offspring was reported within Lassen Volcanic Park by the California Department of Fish and Wildlife. The pack was likely formed by dispersing members from the Lassen Pack, which lives within Lassen County outside of the national park, and marks the first modern presence of wolves within the park itself.

Geology

thumb|Lassen Peak from the summit of Brokeoff Mountain. Photo shows 1915 tongue of lava and Vulcan's Eye.

Formation of basement rocks

thumb|[[Thermal vents at Sulphur Works]]

In the Cenozoic, uplifting and westward tilting of the Sierra Nevada along with extensive volcanism generated huge lahars (volcanic-derived mud flows) in the Pliocene which became the Tuscan Formation. This formation is not exposed anywhere in the national park but it is just below the surface in many areas.

Also in the Pliocene, basaltic flows erupted from vents and fissures in the southern part of the park. These and later flows covered increasingly large areas and built a lava plateau. In the later Pliocene and into the Pleistocene, these basaltic flows were covered by successive thick and fluid flows of andesite lava, which geologists call the Juniper lavas and the Twin Lakes lavas. The Twin Lakes lava is black, porphyritic and has abundant xenocrysts of quartz (see Cinder Cone).

Another group of andesite lava flows called the Flatiron, erupted during this time and covered the southwestern part of the park's area. The park by this time was a relatively featureless and large lava plain. Subsequently, the Eastern basalt flows erupted along the eastern boundary of what is now the park, forming low hills that were later eroded into rugged terrain.

Volcanoes rise

thumb|Lassen Peak eruption from [[Reflection Lake, 1915]]

Pyroclastic eruptions then started to pile tephra into cones in the northern area of the park.

Mount Tehama (also known as Brokeoff Volcano) rose as a stratovolcano in the southwestern corner of the park during the Pleistocene. It was made of roughly alternating layers of andesitic lavas and tephra (volcanic ash, breccia, and pumice) with increasing amounts of tephra with elevation. At its height, Tehama was probably about high.

Approximately 350,000 years ago its cone collapsed into itself and formed a two-mile (3.2 km) wide caldera after it emptied its throat and partially did the same to its magma chamber in a series of eruptions. One of these eruptions occurred where Lassen Peak now stands, and consisted of fluid, black, glassy dacite, which formed a layer thick (outcroppings of which can be seen as columnar rock at Lassen's base).

During glacial periods (ice ages) of the present Wisconsinan glaciation, glaciers have modified and helped to erode the older volcanoes in the park, including the remains of Tehama. Many of these glacial features, deposits and scars, however, have been covered up by tephra and avalanches, or were destroyed by eruptions.

Roughly 27,000 years ago (older data gave an age of 18,000 years), Lassen Peak started to form as a dacite lava dome quickly pushed its way through Tehama's former north-eastern flank. As the lava dome pushed its way up, it shattered overlaying rock, which formed a blanket of talus around the emerging volcano. Lassen rose and reached its present height in a relatively short time, probably in as little as a few years. Lassen Peak has also been partially eroded by Ice Age glaciers, at least one of which extended as much as from the volcano itself.

Since then, smaller dacite domes formed around Lassen. The largest of these, Chaos Crags, is just north of Lassen Peak. Phreatic (steam explosion) eruptions, dacite and andesite lava flows and cinder cone formation have persisted into modern times.

There are active hot springs and mud pots in the Lassen area. Some of these springs are the site of occurrence of certain extremophile micro-organisms, that are capable of surviving in extremely hot environments.

Footnotes

References

Volcano Hazards of the Lassen Volcanic National Park Area, California, U.S. Geological Survey Fact Sheet 022–00, Online version 1.0 (adapted public domain text; accessed September 25, 2006)

External links

"A Fateful Year at Cinder Cone", NASA Earth Observatory, history of the 1666 eruption. Retrieved October 17, 2018.