Dear Mr. Krell,
Thank you for posting your request on History Hub!
Prior to September 27, 1906, any "court of record" (municipal, county, state, or Federal) could grant United States citizenship. As a general rule, the National Archives does not have naturalization records created in state or local courts. However, a few indexes and records have been donated to the National Archives from counties, states, and local courts. We suggest that you contact the National Archives at San Francisco (RW-SB) via email at firstname.lastname@example.org to determine if records from the Siskiyou County Superior Court are available. If the records are not available, we suggest that you contact the California State Archives and request a search for the naturalization records.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RW-SB. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!