- Total 4,203 sq mi (10,890 km2)
- Land 3,918 sq mi (10,150 km2)
- Water 286 sq mi (740 km2)
Population (April 1, 2010)
- Total 9,686
- Estimate (2016) 8,795
- Density 2.3/sq mi (0.89/km2)
Prior to the arrival of Europeans in the region, varying cultures of Native Americans inhabited the county for thousands of years. At the time of European encounter, the Modoc people lived in what is now northern California, near Lost River and Tule Lake. The county was named after them.:216 The Achumawi (or Pit River Indians, for which the Pit River is named), and the Paiute also lived in the area.:216 To the north were the Klamath in present-day Oregon.
The first European explorers to visit Modoc County were the American John C. Frémont and his traveling party (including Kit Carson) in 1846, who had departed from Sutter’s Fort near the confluence of the American and Sacramento Rivers. (This is where the city of Sacramento lies today.):216
The northern boundary of California, and eventually Modoc County, had been established as the 42nd parallel since the time of Mexican possession. In the absence of a reliable survey of the 120th meridian, the eastern boundary of northern California was a subject of contention before Modoc County formed. The Territory of Utah requested jurisdiction to the summit of the Sierra Nevada. At the time, the Warner Mountains were believed to be a part of the Sierra Nevada, so this would have included Surprise Valley, but California denied the request.:76–77
In 1856, the residents of Honey Lake Valley reckoned the 120th meridian to be west of their valley, placing them in Utah territory, and attempted to secede and form a territory they called Nataqua. Nataqua would have included Modoc County. In 1858, the Territory of Nevada, with its capital now in Carson City, successfully seceded from Utah, and assumed jurisdiction to the summit of the Sierra Nevada until the 120th meridian was surveyed in 1863.:76–77
After Nevada was granted statehood in 1864, the region of current Modoc County was placed within jurisdiction of Shasta County, California, and Siskiyou County was, in turn, generated from Shasta County in 1852.
Increasing traffic on the emigrant trail, unprovoked militia raids on innocent Modoc, and a cycle of retaliatory raids increased a cycle of violence between settlers and the tribes in the area.:217 In 1864, the Klamath, Modoc and Yahooskin band of the Shoshone signed a treaty ceding lands in both Oregon and California, and the tribes were colocated on the Klamath Reservation. Harassed by the Klamath, traditional competitors, a band of Modoc led by Captain Jack returned to California and the Tule Lake area.
The Modoc War (or Lava Beds War) of 1872-73 brought nationwide attention to the Modoc during the protracted battles. From strong defensive positions in the lava tubes, 52 Modoc warriors held off hundreds of US Army forces, who called in artillery to help.:218–219 Peace talks in 1873 stalled when the Modoc wanted their own reservation in California. Warriors urged killing the peace commissioners, thinking that the Americans would then leave, and Captain Jack and others shot and killed General Edward Canby and Rev. Eleazer Thomas, and wounded others. More Army troops were called in to lay siege to Captain Jack’s Stronghold. Dissension arose, and some Modoc surrendered. Finally most were captured, and those responsible for the assassinations were tried and executed. More than 150 Modoc were transported to Indian Territory as prisoners of war.:219 The area has since been designated the Lava Beds National Monument.
Settlement of the county began in earnest in the 1870s, with the timber, gold, agriculture, and railroad industries bringing most of the settlers into the area. The county was a crossroads for the Lassen Applegate Trail, which brought settlers north from Nevada to the Oregon Trail and south to trails leading into California’s central valley. Early settlers included the Dorris, Belli, Essex, Scherer, Trumbo, Flournoy, Polander, Rice and Campbell families.
Modoc County was formed when Governor Newton Booth signed an Act of the California Legislature on February 17, 1874 after residents of the Surprise Valley region lobbied for the creation of a new county from eastern Siskiyou County land.:216 The county residents considered naming the newly formed county after General Edward Canby, who had been killed the year before at peace talks in an ambush by Modoc. The idea of naming the county “Summit” was also considered, but the populace eventually settled on “Modoc”; the war was over and 153 of Captain Jack‘s band had been transported to Indian Territory as prisoners.
The Dorris Bridge post office opened in 1871, was renamed Dorrisville in 1874; due to its central location, Dorrisville became the county seat when Modoc County formed that year, although both Adin and Cedarville were larger towns.:84 In 1876, it was renamed Alturas, which means “The Heights” in Spanish. The census of 1880 showed a population of 148. Settlement continued over the next two decades, until the city was officially incorporated on September 16, 1901; the county’s only incorporated city.
Tule Lake was the largest of the “segregation camps.” On November 8, 2005 Senator Dianne Feinstein called for the camp to be designated a National Historic Landmark. In December 2008 it was designated by President George W. Bush as one of nine sites—the only one in the contiguous 48 states—to be part of the new World War II Valor in the Pacific National Monument.