SR 523 constitutes a 2.45 mile route along NE 145th Street straddling the Seattle and Shoreline city line. The multi lane boulevard joins SR 99 (Aurora Avenue N) with Interstate 5 at Exit 175 and SR 522 (Lake City Way NE / Bothell Way NE) along its course.
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| Eastbound shield assembly for SR 523 posted after the NE 145th Street intersection with 5th Avenue NE and Interstate 5. 08/29/06 |
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| SR 523 (NE 145th Street) straddles the Shoreline and Seattle city line through the Paramount Park community and meets 15th Avenue NE. 15th Avenue travels near by to Pinehurst, Ridgecrest, and North City. 08/29/06 |
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| Continuing east along SR 523 (NE 145th Street) toward Kenwood and Briarcrest. 08/29/06 |
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| A set of mast-arm traffic lights posted at the intersection of SR 523 east and 20th Avenue NE. 08/29/06 |
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| Lowering to the intersection with 25th Avenue NE at the Kenwood section of north Seattle on NE 145th Street east. 08/29/06 |
