Question: How large is the Lake Isabella State Forest, as compared to the 1090000 acre wilderness area where it is located?

Context paragraphs:
Jessup River Wild Forest: The Jessup River Wild Forest is a 47350 acre Forest Preserve area in the towns of Lake Pleasant, Arietta, Indian Lake, and Wells in Hamilton County.  NY-28 is the border of the forest to the north and NY-30 is the border of the forest in the southeast.  West Canada Lake Wilderness Area is located to the west, Siamese Ponds Wilderness Area is located to the east, and the Silver Lake Wilderness Area to the south.  Indian Lake, Piseco, Speculator, and Wells are located near or within the Jessup River Wild Forest.  There are many trails to hike on, and many rivers and lakes to canoe or fish on within the forest.  Part of the Northville-Placid Trail is located within the forest.

Marble Mountain Wilderness: The Marble Mountain Wilderness is a 241744 acre wilderness area located 60 mi southwest of Yreka, California, in the United States.  It is managed by the U.S. Forest Service and is within the Klamath National Forest in Siskiyou County.  The land was first set aside on April 1931 as the Marble Mountain Primitive Area, which comprised 234957 acre .  It was one of four areas to gain primitive status under the Forest Service's L-20 regulations that year.  In 1964, it became a federally designated wilderness area when the U.S. Congress passed the Wilderness Act.

Dominguez Canyon Wilderness: The Dominguez Canyon Wilderness is a U.S. Wilderness Area located southeast of Grand Junction in western Colorado.  The 66280 acre wilderness area established in 2009, the largest BLM roadless area in the state of Colorado, includes two major canyon systems that drain the northeastern corner of the Uncompahgre Plateau.  The Wilderness Area is a portion of the larger Dominguez-Escalante National Conservation Area, 209610 acre in size.

Black Creek Wilderness: Black Creek Wilderness is a 5052 acre wilderness area in the U.S. state of Mississippi.  Located within the De Soto National Forest, Mississippi's largest wilderness lies in the broad valley of Black Creek, stained a deep caramel color by the tannic acid of decaying vegetation.  The upland areas protect significant areas of longleaf pine forest, while the river creates bottomland hardwoods and shorelines with sand bars.  It is therefore an important representation of typical coastal plain ecosystems that existed before forests were cleared and the rivers dammed.  The Pascagoula River is nationally significant as one of the largest unimpeded rivers remaining in the lower 48 states.  Rare species include the Pearl darter and the Yellow-blotched map turtle, both found only in this river and its tributaries.  This wilderness area is surrounded by De Soto National Forest, which is also one of the nation's most important areas of coastal plain ecosystems.

Pine Valley Mountain Wilderness: Pine Valley Mountain Wilderness is a 50232 acre wilderness area located in the Dixie National Forest in the U.S. state of Utah.  It is the fourth-largest wilderness area located entirely within the state (following the High Uintas Wilderness, Zion Wilderness, and Cedar Mountain Wilderness).  The wilderness designation protects the Pine Valley Mountain range, a large rock outcrop surrounded by desert.  The Pine Valley Mountains form the Pine Valley Laccolith, one of the largest laccoliths in the United States.  Elevations in the wilderness range from 6000 ft to 10365 ft at the summit of Signal Peak.

Paddy Creek Wilderness: The Paddy Creek Wilderness is a 7019 acre wilderness area in the U.S. state of Missouri, United States.  The United States Congress designated it wilderness in 1983.  Paddy Creek Wilderness is located within the Houston-Rolla Ranger District, of the Mark Twain National Forest, 10 mi northwest of Licking, Missouri.  It was named for Big and Little Paddy Creeks that run through the area.  The Paddy Creek Wilderness is one of eight wilderness areas protected and preserved in Missouri.  Big Piney Trail is a 17 mi long loop that traverses this wilderness area and is popular among avid backpackers.  The 17 mi loop trail can be hiked as a 10 mi stretch (north section) or the 7.5 mi south section.  The trails are rugged and can be challenging for the inexperienced or unprepared hiker.  Horseback riding is also common on the Piney Creek Trail.

Lake Isabella: Lake Isabella (also called Isabella Lake ) is a reservoir in Kern County, California created by the earthen Isabella Dam.  It was formed in 1953 when the U.S. Army Corps of Engineers dammed the Kern River at the junction of its two forks at Whiskey Flat.  At 11000 acres , it is one of the larger reservoirs in California.  The area is in the southern end of the Sierra Nevada range and the lake itself is located in low mountains at an elevation of approximately 2500 ft where summer temperatures reach over 100 degrees (°F) but low enough to avoid winter snows on the surrounding ridges.  Lake Isabella is located about 40 mi.  northeast of Bakersfield, and is the main water supply for that city.  Lake Isabella can be reached by car from Bakersfield via state Highway 178 and from Delano via Highway 155.  The former towns of Isabella and Kernville were flooded by the newly created reservoir.

Boundary Waters Canoe Area Wilderness: The Boundary Waters Canoe Area Wilderness (BWCAW or BWCA), is a 1090000 acre wilderness area within the Superior National Forest in northeastern Minnesota (United States) under the administration of the U.S. Forest Service.  A mixture of north woods forests and glacial lakes and streams, the BWCAW's preservation as a primitive wilderness began in the 1900s and culminated in the Boundary Waters Canoe Area Wilderness Act of 1978.  It is a popular destination for both canoeing and fishing on its many lakes and is one of the most visited wildernesses in the United States.

Lake Isabella State Forest: The Lake Isabella State Forest is a state forest located in Lake County, Minnesota.  The forest is located completely within the Superior National Forest and the Boundary Waters Canoe Area Wilderness, and is thus subject to the management of the United States Forest Service.  At 638 acre , it one of the smallest forests in the Minnesota state system.

Piney Creek Wilderness: The Piney Creek Wilderness is an 8122 acre wilderness area in Missouri.  The United States Congress designated it wilderness in 1980.  The Piney Creek Wilderness is located within the Ava-Cassville-Willow Springs Ranger District of the Mark Twain National Forest, east of Cassville, Missouri.  The area is named after Piney Creek, which runs the length of the wilderness area and eventually empties into the James River arm of Table Rock Lake.  The Piney Creek Wilderness is one of eight wilderness areas of the Mark Twain National Forest that are protected and preserved in Missouri.

Supporting paragraphs: Lake Isabella State Forest Boundary Waters Canoe Area Wilderness
Answer: 638 acre