Washington State Route 906

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State Route 906 marker

State Route 906

Map
SR 906 is highlighted in red.
Route information
Auxiliary route of I-90
Maintained by WSDOT
Length2.65 mi[1] (4.26 km)
ExistedMay 11, 1967[2]–present
Major junctions
West end I-90 in Snoqualmie Pass
East end I-90 in Hyak
Location
CountryUnited States
StateWashington
CountiesKing, Kittitas
Highway system
← SR 904→ SR 970

State Route 906 (SR 906) is a 2.65-mile-long (4.26 km)

Sunset Highway that were bypassed by the construction of the controlled-access Interstate Highway
over the pass. Between 360 and 2,100 vehicles use the road on an average day in 2012.

Route description

SR 906 begins at a

half-diamond interchange with I-90, exit 52, in Snoqualmie Pass, King County.[3] North of I-90, Summit Road provides access to the Alpental ski area.[4] Only the first 3⁄10 mile (480 m) of the highway is in King County, with the remainder of the highway in Kittitas County.[1] After crossing the county line, SR 906 is bounded by Summit West on the west side of the highway and the Snoqualmie Pass Traveler's Rest rest area on the east side. Access to the Pacific Crest Trail is provided from the one of Summit West's parking lots. Just south of the rest area is an intersection with Yellowstone Road, which links back to I-90 at a full diamond interchange.[5][6] Yellowstone Road was once a part of the Yellowstone Trail
, a cross-country auto-trail.

Summit Central borders the west side of the highway with parking lots for the ski area on the east side of the highway, as the two-lane 35-mile-per-hour (56 km/h)

half-diamond interchange/partial cloverleaf serves as the eastern terminus of SR 906 as it reconnects to I-90.[7] The roadway continues north past the interchange as Lake Mardee Road, named after the nearby lake of the same name.[6]

Every year, WSDOT conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of annual average daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2012, WSDOT calculated that, on average, 360 vehicles used the highway near its eastern terminus, and as many as 2,100 vehicles used the highway just west of Yellowstone Road. Truck traffic was not reported between 2009-2012, and traffic counts have remained steady over the same period.[9]

History

SR 906 at its western terminus, an interchange with I-90, in Snoqualmie Pass

Automobile roads over

Primary State Highway 2 in addition to US 10.[10] The highway was paved between 1931 and 1939.[14][15]

SR 906 came to be the name of the highway during the construction of Interstate 90 over the pass. Parts of US 10 were not up to the new

limited-access highway was built, bypassing older alignments of roadway.[16] The roadway now known as SR 906 was a bypassed section of the old Sunset Highway that was not up to Interstate Highway standards on May 11, 1967.[2]

Major intersections

CountyLocation[17]mi[1]kmDestinationsNotes
half-diamond interchange
.
Roadway continues as Alpental Road.
KittitasHyak0.470.76Snoqualmie Summit Traveler's Rest
0.631.01
 To I-90 (Yellowstone Road)		Former Yellowstone Trail
2.554.10
SR 906 Spur
east		Western terminus of SR 906 Spur
2.59–
2.65		4.17–
4.26
Seattle, Ellensburg
I-90 exit 54; eastern terminus, hybrid interchange.
Roadway continues as Lake Mardee Road.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Spur route

At the SR-906 spur's western terminus, facing east

Spur plate.svg

State Route 906 Spur marker

State Route 906 Spur

LocationHyak, Washington
Length0.43 mi[1] (690 m)

State Route 906 Spur (SR 906 Spur) is a 0.43-mile-long (690 m)

AADT and calculated that 300 vehicles-per-day used the spur route in 2012. This number has remained steady between 2009 and 2012.[9]

Major intersections

The entire highway is in Hyak, Kittitas County.

mi[1]kmDestinationsNotes
0.000.00
 SR 906 to I-90		Western terminus
0.430.69WSDOT maintenance facilityEastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

References

  1. ^ a b c d e f g h Staff (2012). State Highway Log: Planning Report 2012, SR 2 to SR 971 (PDF) (Report). Washington State Department of Transportation. pp. 1775–1777. Retrieved February 14, 2013.
  2. ^ a b "State Route No. 906. (47.17.850)". Revised Code of Washington. 2005. Retrieved December 21, 2013.
  3. ^ Junction SR 906/W Summit Rd (PDF) (Map). Not to scale. Washington State Department of Transportation. April 24, 2012. Retrieved December 21, 2013.
  4. ^ Alpental Trail Maps (PDF) (Map). Scale not given. Cartography by Ron Bomba. The Summit at Snoqualmie. 2010. Retrieved December 21, 2013.
  5. ^ Junction E Summit Rd (PDF) (Map). Not to scale. Washington State Department of Transportation. April 23, 2012. Retrieved December 21, 2013.
  6. ^ a b c d Google (February 14, 2013). "State Route 906" (Map). Google Maps. Google. Retrieved February 14, 2013.
  7. ^ a b Junction SR 906 (PDF) (Map). Not to scale. Washington State Department of Transportation. April 24, 2012. Retrieved December 21, 2013.
  8. ^ Summit East (PDF) (Map). Scale not given. Cartography by Ron Bomba. The Summit at Snoqualmie. 2012. Retrieved December 21, 2013.
  9. ^ a b Staff (2012). Annual Traffic Report (PDF) (Report). Washington State Department of Transportation. p. 210. Retrieved December 21, 2013.
  10. ^ a b Staff. "I-90: Snoqualmie Pass East; History". Washington State Department of Transportation. Retrieved December 21, 2013.
  11. Yellowstone Trail Association
    . 1925. Retrieved December 21, 2013.
  12. OCLC 32889555. Retrieved November 7, 2013 – via Wikimedia Commons
    .
  13. ^ Federal Highway Administration (2012). "NBI Structure Number: 0001140B0000000". National Bridge Inventory. Federal Highway Administration.
  14. ^ Highway Map: State of Washington (Map). 1:181,500. Washington State Department of Highways. January 1931. Retrieved December 21, 2013.
  15. ^ Highways of the State of Washington (Map). 1:475,200. Cartography by Rand McNally & Co. Washington State Department of Highways. 1939. Retrieved December 21, 2013.
  16. ProQuest 384338744
    .
  17. ISBN 978-0-5288-8210-4
    .
  18. ^ Google (February 14, 2013). "State Route 906 Spur" (Map). Google Maps. Google. Retrieved February 14, 2013.

External links

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