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).
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| Eastbound shield assembly for SR 523 beyond 5th Avenue NE and the exchange with Interstate 5. 08/29/06 |
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| SR 523 (NE 145th Street) straddles the Shoreline and Seattle city line east through the Paramount Park community. 15th Avenue NE crosses NE 145th Street 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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| SR 523 (NE 145th Street) east at 20th Avenue NE and the Olympic Hills neighborhood of Seattle. 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 |
East
