The SR 141 designation has been used for two differen routes at different times.
Earlier SR 141
The earlier SR 141, first posted when the current state highway numbering system was first used in 1964, ran from then SR 14 at Riffe (a few miles east of Mossyrock) to Jct SR 7 at Morton. Around 1967 Mossyrock Dam was completed on the Cowlitz River just upstream from the town of Mossyrock. The resulting reservoir, now called Riffe Lake, inundated the communities of Riffe and Kosmos and much of SR 14. A new SR 14 alignment was built from Mossyrock to Morton, incorporating portions of SR 141. The SR 141 designation went into disuse. SR 14 then continued via what had been the southern end of SR 7 and a partial new alignment from Morton to Glenoma. This route became US 12 later in 1967.
Before 1964, the highway from Riffe to Morton had been SSH 5L.
Later SR 141
When SR 14 was switched from the White Pass Highway to the route SR 14 now follows along the Columbia River, SR 121 from Bingen via White Salmon and Trout Lake to the Gifford Pinchot National Forest near Mount Adams was renumbered SR 141. Today, SR 141 is 29.30 miles long.
SR 141 Spur
Spur SR 141 connects the SR 141 mainline NW of White Salmon with SR 14 west of Bingen. This spur is 2.16 miles long.
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