Blue Hills | |
---|---|
Highest point | |
Peak | Gold Mountain |
Elevation | 1,761 ft (537 m) |
Coordinates | 47°32′55″N122°47′10″W / 47.54861°N 122.78611°W |
Geography | |
Country | United States |
State | Washington |
Region | Western Washington |
Range coordinates | 47°33′00″N122°48′00″W / 47.55000°N 122.80000°W |
The Blue Hills just west of Bremerton, Washington, also called the Bremerton Hills, Bald Hills, and Wildcat Hills, consist of Gold Mountain, Green Mountain, and several informally named hills. [1] [2] Reaching an elevation of 1761 feet (537 meters), a thousand feet above the glacial till that fills the Puget Lowland, [3] they form a prominent landmark visible around the region. [4] They are formed of uplifted blocks of marine basalts, the steep-walled canyons between the various summits being the fissures between the blocks (particularly prominent at Gold Creek and Union River). In addition to Gold Mountain and Green Mountain (the named members of the Blue Hills [5] ) are several other prominent peaks unofficially named according to their elevation (in feet):
For a more complete list of hills see List of mountains and hills of Kitsap County, Washington. The name "Blue Hills" is said to come from the green trees appearing blue at a distance due to atmospheric optics. [9]
The Blue Hills are perched on the north edge of the Seattle uplift, an east-west trending syncline or arch between the Seattle Fault and Tacoma Fault formed by north-south compression of the bedrock. (See Puget Sound faults#Geological setting.)
Gold Mountain (on the south) is composed mainly of marine basalt flows and related volcaniclastic rocks (such as breccias and sedimentary interbeds) of the Crescent Formation, part of the Siletzia terrane that formed around 50 million years ago (early Eocene). Green Mountain is formed of slightly older formations of gabbro and pegmatite, intruded by dikes of basalt and diabase. Most of the dikes are oriented north-northeast (NNE), suggesting they formed at a time of east-southeast–west-northwest (ESE-WNW) extension. This is parallel to the Olympic–Wallowa Lineament (OWL), a major regional feature that passes just north of Bremerton which some believe shows strike-slip (horizontal) motion, but a connection with the OWL is yet to be shown. Sharp downwarping of these formations has created numerous faults, including the dip-slip (vertical movement) Gold Creek fault that separates the two mountains. Strands of the Seattle Fault, which east of here trend nearly due west-east, appear to turn to the southwest in the vicinity of Green Mountain. [10]
Popular lore says Gold Mountain was so named on account of the presence of gold. However, state geological documents make no mention of any gold or gold mining in Kitsap County. [11]
On Green Mountain, an old and much photographed adit near the headwaters of Tin Mine Creek is probably from the Chico "tin mine" the creek is named after. [12] In 1895 it was reported that ore of three to five percent tin had been found in this vicinity, and the Cook Kitchen Mining Company had been incorporated with $2,000,000 of capital to develop the claim. [13] An optimistic report in 1897 mentioned four shafts, one eighty-five feet deep, [14] and there was report at the end of 1898 of a new shaft. [15] However, in the 1897 report the means of reducing the ore were only "proposed"; there are no indications that any ore was produced or shipped. Neither the site nor the company is mentioned in reports at the turn of the century on mines and mineral resources in the state. A report in 1918 said that there had been "no subsequent developments to indicate the authenticity of this deposit", and that a careful examination in 1906 failed to show any tin. [16]
The only other known metalliferous mining claim in all of Kitsap county – the "Elmer Nelson Property" – is on the south flank of Green Mountain, just above Gold Creek. [17] Very little is known about this claim except its reported location and that development appears to have been limited to a surface trench. Cobalt is reported as the primary mineral of interest, with no mention of gold, silver, or any other mineral.
The hills contain the headwaters of the Union River and Tahuya River, draining into Hood Canal south and southwest respectively. A number of creeks also rise in the hills, draining directly north into Hood Canal (e.g. Big Beef Creek, "the largest and most productive salmon stream on the northeast shore of Hood Canal" [18] ), northeast into Dyes Inlet (Lost Creek/Wildcat Creek/Chico Creek, "the most productive salmon stream in Kitsap County, producing as many salmon as all other streams combined" [19] ) and east into Sinclair Inlet (Heins Creek/Gorst Creek). [20]
The hills have long been identified as an important watershed for Bremerton and the surrounding area, as the Kitsap Peninsula has no major lakes or rivers, no access to mountain reservoirs fed by snowmelt, and the groundwater is limited in quantity and quality. [21] [22] [23]
[The Kitsap Peninsula] approaches the description of school geographies – almost completely surrounded by water. Watersheds are limited and streams small and scattered...The [reservoir] most recently developed is the Union River, which has a watershed area of only 3.2 sq. mi but which, as a result of topographic conditions, is quite productive...
— Cliff Casad and John W. Cunningham, Construction of the Union River Dam at Bremerton, Wash., 1957 [24]
Moist Pacific air reaches the Blue Hills through a gap in the coastal ranges called Chehalis Gap. [25] [26] [27] The Union River, which rises in the hills, was impounded in a deep valley on the eastern flank of Gold Mountain by Casad Dam, completed in 1957. The dam creates the Union River Reservoir supplying over half of Bremerton's annual requirements. [28] 95% of the watershed's land was purchased by Bremerton in the 1920s, and is entirely within the Blue Hills. [29] [30]
A number of developed and undeveloped areas for recreation exist in and near the Blue Hills. The largest that is open to the public is Green Mountain State Forest, a multi-use, over 6,000-acre (2,400 ha) state forest containing Green Mountain itself and owned by Washington State Department of Natural Resources. The state forest allows camping, off-road vehicles, horseback riding, and hiking. [31] The Bremerton watershed contains the eastern half of Gold Mountain with an associated restricted protective buffer, and is somewhat larger than the state forest. [32] Entry to the watershed by the general public is restricted, but Gold Mountain Golf Course was built on city watershed property on the south side of the hills. [33] Together the watershed and Green Mountain State Forest represent over half of Kitsap County's open space. [32]
The Mountaineers maintain an outdoor theatre, Kitsap Forest Theater, in their 386-acre (156 ha) Rhododendron Preserve on the north side of the hills. [34]
There is one 386-acre (156 ha) former shooting range, Camp Wesley Harris, owned by the U.S. Navy, and the private Kitsap Rifle & Revolver Club. [35]
Other facilities include county and city parks, as listed below. [32]
Kitsap County is a county in the U.S. state of Washington. As of the 2020 census, its population was 275,611. Its county seat is Port Orchard; its largest city is Bremerton. The county, formed out of King County and Jefferson County on January 16, 1857, is named for Chief Kitsap of the Suquamish Tribe. Originally named Slaughter County, it was soon renamed.
The Grande Ronde River is a 210-mile (340 km) long tributary of the Snake River, flowing through northeast Oregon and southeast Washington in the United States. Its watershed is situated in the eastern Columbia Plateau, bounded by the Blue Mountains and Wallowa Mountains to the west of Hells Canyon. The river flows generally northeast from its forested headwaters west of La Grande, Oregon, through the agricultural Grande Ronde Valley in its middle course, and through rugged canyons cut from ancient basalt lava flows in its lower course. While it joins the Snake River upstream of Asotin, Washington, more than 90 percent of the river's watershed is in Oregon.
Manchester State Park is a 111-acre (45 ha) state park in Kitsap County, Washington, United States. It is situated on the east side of the Kitsap Peninsula with 3,400 feet (1,000 m) of shoreline facing Puget Sound. It was at one time a harbor defense installation for the nearby Bremerton, then a fuel supply depot and U.S. Navy fire-fighting station. The park contains a former torpedo warehouse, a mining casement, and a gun battery. Park activities include picnicking, camping, boating, fishing, hiking on 1.9 miles (3.1 km) of trails, birdwatching, volleyball, wildlife viewing, and horseshoes.
Chico is an unincorporated community and census-designated place (CDP) in Kitsap County, Washington, United States. Named in 1889 for a local Indian, Chico is located on the Dyes Inlet waterfront, south of Silverdale. At the 2020 census the community had a population of 2,723.
The Manette Peninsula is a headland that is part of the larger Kitsap Peninsula, located on the eastern flank of the Kitsap Peninsula, in western Washington, United States.
Wildcat Creek is a 13.4-mile-long (21.6 km) creek which flows through Wildcat Canyon situated between the Berkeley Hills and the San Pablo Ridge, emptying into San Pablo Bay in Contra Costa County, northern California.
State Route 304 (SR 304) is a state highway in Kitsap County, Washington, United States. It connects SR 3, a regional freeway, to the Puget Sound Naval Shipyard and downtown Bremerton. The designation of SR 304 continues onto the Seattle–Bremerton ferry operated by Washington State Ferries to Colman Dock in Downtown Seattle, terminating at SR 519 on Alaskan Way.
State Route 310 (SR 310) is a 1.84-mile-long (2.96 km) state highway in the U.S. state of Washington, serving the city of Bremerton in Kitsap County. The highway travels east within Bremerton from an interchange with SR 3 to an intersection with SR 304 as Kitsap Way and Callow Avenue. SR 310 was established in 1991, following the former alignment of SR 3 on city streets in Bremerton before the construction of its current freeway in the 1960s and 1970s. The highway was codified in 1915 as State Road 21 in 1915 and Primary State Highway 21 (PSH 21) in 1937 before becoming SR 3 during the 1964 highway renumbering.
The Puget Sound region is a coastal area of the Pacific Northwest in the U.S. state of Washington, including Puget Sound, the Puget Sound lowlands, and the surrounding region roughly west of the Cascade Range and east of the Olympic Mountains. It is characterized by a complex array of saltwater bays, islands, and peninsulas carved out by prehistoric glaciers.
The Union River is a stream in the U.S. state of Washington. It originates in central Kitsap Peninsula and flows south, emptying into the end of Hood Canal. The Union River Reservoir provides drinking water for the nearby city of Bremerton.
The Puget Sound faults under the heavily populated Puget Sound region of Washington state form a regional complex of interrelated seismogenic (earthquake-causing) geologic faults. These include the:
Stony Creek is a 73.5-mile (118.3 km)-long tributary of the Sacramento River in Northern California. It drains a watershed of more than 700 square miles (1,800 km2) on the west side of the Sacramento Valley in Glenn, Colusa, Lake and Tehama Counties.
Guadalupe Creek or Guadalupe Valley Creek is a short eastward-flowing stream whose watershed originates just east of the highest peak of San Bruno Mountain in San Mateo County, California, United States. It courses through San Bruno Mountain State and County Park and Brisbane before entering the Brisbane Lagoon.
Gold Mountain is a 1,761-foot (537 m) summit in the Blue Hills on the Kitsap Peninsula of Washington state, in the United States' Pacific Northwest. It is the highest point on the Kitsap Peninsula and the highest point in Kitsap County, Washington, and nearby 1,639-foot (500 m) Green Mountain is the second-highest point.
Green Mountain is a 1,700-foot (520 m) summit in the Blue Hills on the Kitsap Peninsula of Washington state, in the United States' Pacific Northwest. It is the second highest point on the Kitsap Peninsula and in Kitsap County, Washington, after 1,761-foot (537 m) Gold Mountain.
Toe Jam Hill, 425 feet tall, is the high point on Bainbridge Island, Washington and one of the highest points in Kitsap County, Washington.
Casad Dam is a concrete arch dam in Bremerton, Kitsap County, Washington), built starting in 1955 and completed in 1957.
The Satsop Hills are foothills of the Olympic Mountains in Mason County, Washington north of Matlock, Washington, between Wynoochee Lake to the west and Lake Cushman to the east.
Hills in the Puget Lowland, between the Cascades and the Olympic Mountains, including the entire Seattle metropolitan area, are generally between 350–450 feet (110–140 m) and rarely more than 500 feet (150 m) above sea level. Hills are often notable geologically and for social reasons, such as the seven hills of Seattle.
Much of the region's water is stored naturally in winter snowpack in the mountains.
...most of the readily accessible water supply resources will have been appropriated by the year 1990, and recommended seeking sources outside the basin (WRIA 15). The City of Bremerton has applied for water rights totaling 250 cfs on the Duckabush, Hamma Hamma, and Skokomish Rivers....
Because of the Chehalis Gap and the Olympic Mountains, precipitation decreases markedly from southwest to northeast through the Puget Sound. The gap allows moist winds to enter the southern part of the sound, giving Olympia fifty inches of annual rainfall., p. 38.
Winter storms generally approach the County from the southwest. The southwestern portion of the County receives relatively high winter rainfall from storms which enter the area through a topographic gap between the Olympic Mountains and the Black Hills..
Most of Kitsap County is a maritime land moderately low in elevation ... A small, rough, broken, mountainous area, called Green Mountain and the Blue Hills near Bremerton, is the highest area. This localized upland reaches 2,500 feet on the Green Mountain ridge.