Engineering and Regional Operations, Bridge and Structures Office (April 2020). "Bridge List, M23-09.10"(PDF). Washington State Department of Transportation. p. 273. Retrieved September 2, 2021.
2016 Annual Traffic Report(PDF) (Report). Washington State Department of Transportation. 2017. p. 158. Archived from the original(PDF) on August 12, 2017. Retrieved September 2, 2021.
2016 Annual Traffic Report(PDF) (Report). Washington State Department of Transportation. 2017. p. 158. Archived from the original(PDF) on August 12, 2017. Retrieved September 2, 2021.