Question: What is the lowest point of the Humboldt River?

Context paragraphs:
Humboldt River: The Humboldt River runs through northern Nevada in the western United States.  At approximately 290 mi long it is the third longest river in the Great Basin, after the Bear and Sevier Rivers.  It has no outlet to the ocean, but instead empties into the Humboldt Sink.  It is the fifth largest river in the United States, in terms of discharge, that does not ultimately reach the ocean, while it is the largest in terms of area drained.  Through its tributaries the river drains most of sparsely populated northern Nevada, traversing the state roughly east to west, and passing through repeated gaps in the north-south running mountain ranges.  It furnishes the only natural transportation artery across the Great Basin and has provided a route for historic westward migrations and subsequent railroads and highways.  The river is named for the German naturalist Alexander von Humboldt.

Line parent: A peak's line parent is the closest higher peak on the highest ridge leading away from the peak's "key col".  A col is the lowest point on the ridge between two summits and is synonymous with pass, gap, saddle and notch.  A peak's "key col" is the lowest point on the ridge which connects the peak and a higher peak.  If there is more than one ridge which can be followed to a higher peak then the line parent is the peak closest to the key col. Usually, a line parent must meet some prominence criteria, which might vary depending on the author and the location of the peak.

Humboldt River Bridge: The Humboldt River Bridge is a concrete arch bridge across the Humboldt River in Winnemucca, Nevada, United States, that was built in 1910.  It is 130 ft long and was the first reinforced concrete archdeck bridge built in the county.  It is significant as one of the last pair of such bridges surviving in Nevada, and also for association with economic expansion of Winnemucca in the early 20th century.

Humboldt Range: The Humboldt Range is a largely north-south running range of mountains in northwest Nevada, USA, that extend from the town of Imlay in the north to the junction with the West Humboldt Range in the south.  It is bordered continuously by Interstate 80 and the Humboldt River, largely expanded in the form of the Rye Patch Reservoir in this area, on the west side and by a long and fairly broad Buena Vista Valley to the east, in a typical basin-and-range pattern.  The Humboldts are ostensibly visible to travelers along Interstate 80, especially with respect to the highest point of the range, Star Peak, which with a quite nicely defined tip reaches an elevation of 9,836 feet (2,998 m), located in the center of the north range section.  The midpoint of the range is in the area of Fourth of July Flat.  The Humboldt Range is also noteworthy for having a famous historical town at its base on the eastern side called Unionville, which, for a brief period, was home to Samuel Clemens.  Another historical site, now a ghost town, nearby is called Star City.  Unlike some ranges in the vicinity, the substantial height of the Humboldts allows for a number of continuously flowing watersheds, and hiking the terrain is a somewhat noted activity.

Palisade Canyon: Palisade Canyon is a Nevada landform along the Humboldt River between Carlin upstream, and Battle Mountain downstream.  The Humboldt, rather than flowing into the ocean, eventually loses all its water to evaporation in the Humboldt Sink, and stream-gage measurements undertaken by the United States Geological Survey suggest that Palisade Canyon is the point where the river's flow ceases to increase and begins to decrease.

Little Humboldt River: The Little Humboldt River is a tributary of the Humboldt River, approximately 60 mi long, in northern Nevada in the western United States.  It is an intermittent stream draining a rugged area on the edge of the Owyhee Desert in the Great Basin.

Independence Mountains: The Independence Mountains are a mountain range in northern Elko County, Nevada, United States.  The range reaches a maximum elevation of 10439 ft on the summit of McAfee Peak.  The range extends northward approximately 70 mi from a point near Carlin to the banks of the Owyhee River.  To the east is the North Fork of the Humboldt River, and to the west is the Owyhee Desert.  Passing to the south is the main branch of the Humboldt River, and near the northern end of the range is the Wild Horse State Recreation Area.  The Owyhee River is tributary to the Snake-Columbia system, while the Humboldt is within the Great Basin.

Carlin Tunnel: The Carlin Tunnel is a collective name for a set of four tunnel bores in the Humboldt River's Carlin Canyon, east of Carlin in Elko County, Nevada, United States.  The two railroad bores were constructed for different purposes at different times, while the two highway bores were constructed concurrently, all with the goal of bypassing a sharp bend in the river.  Currently, two of the bores carry Interstate 80, while the other two bores carry Union Pacific Railroad's Overland Route and Central Corridor.  Bridges over the Humboldt River are adjacent to both portals of three tubes, including the two freeway bores and one of the railroad bores.

North Fork Humboldt River: The North Fork of the Humboldt River is an approximately 70 mi long tributary of the Humboldt River in northern Elko County, Nevada.

Great Basin: The Great Basin is the largest area of contiguous endorheic watersheds in North America.  It spans sections of Wyoming, Idaho, Utah, Nevada, Oregon, California and the Mexican state of Baja California.  It is noted for both its arid climate and the basin and range topography that varies from the North American low point at Badwater Basin to the highest point of the contiguous United States, less than 100 mi away at the summit of Mount Whitney.  The region spans several physiographic divisions, biomes/ecoregions, and deserts.

Supporting paragraphs: Humboldt River Great Basin
Answer: Badwater Basin