This image was taken on Dec 27, 2019 at 6:17:28pm, 30 second exposure, ISO 3200, f/1.8.
The location was the Moraine area within Rocky Mountain National Park, just off Bear Lake Road, and the azimuth of alignment for the shot was approx 299deg (northwest).
The previous image was taken at 6:16:07pm and the subsequent image was taken at 6:18:14pm and the streak seen in the upper left hand corner does not appear in any other image...when looking at the raw image it definitely does not look like an aircraft and is too bright to be a satellite. ISS did fly over Colorado but I think it wasnt due to fly over for another 10 mins and does not appear in any other image. My ephemeris indicates we are between the Ursids and the Quadrantids...so bottom line I'm not actually sure what that streak is but appreciate your thoughts and/or insights!

Camera body: Canon EOS Ra
Lens: Sigma 14mm f/1.8
Tripod: Three Legged Thing
Ballhead: Manfrotto

Basic photoshopping to increase contrast, brightness, and color...no objects inserted or deleted from the image...raw image available for inspection