Tributary to Kerry Lake - 198692 - Monitoring Appendix

Baseline monitoring was conducted in 2025 at PSCIS crossing 198692 ahead of planned remediation, to inform future effectiveness monitoring once the structure is upgraded. Site location, background, and the 2024 habitat confirmation assessment are documented in Irvine and Schick (2025); the 2024 site appendix is available at https://www.newgraphenvironment.com/fish_passage_peace_2024_reporting/trib-to-kerry.html.

Fish Sampling

Electrofishing was conducted downstream and upstream of PSCIS crossing 198692 in 2025 to establish a pre-remediation baseline. Per-site capture results are in Table 5.39; densities are in Table 5.40.

fpr::fpr_table_fish_site()

Table 5.39: Fish sampling site summary for 198692.

site	passes	ef_length_m	ef_width_m	area_m2	enclosure
198692_us_ef1	1	16	–	–	partial enclosure
198692_us_ef2	1	12	–	–	open
198692_ds_ef1	1	34	–	–	partial enclosure
198692_ds_ef2	1	4	–	–	open

fpr::fpr_table_fish_density()

Table 5.40: Fish sampling density results summary for 198692.

local_name	species_code	life_stage	catch	density_100m2	nfc_pass
198692_ds_ef1	Rainbow Trout	fry	6	–	FALSE
198692_ds_ef1	Rainbow Trout	parr	4	–	FALSE
198692_ds_ef2	Rainbow Trout	fry	1	–	FALSE
198692_ds_ef2	Rainbow Trout	juvenile	4	–	FALSE
198692_ds_ef2	Rainbow Trout	parr	9	–	FALSE
198692_us_ef1	Rainbow Trout	fry	1	–	FALSE
198692_us_ef2	Rainbow Trout	fry	3	–	FALSE
198692_us_ef2	Rainbow Trout	parr	7	–	FALSE
* nfc_pass FALSE means fish were captured in final pass indicating more fish of this species/lifestage may have remained in site. Mark-recaptured required to reduce uncertainties.

Environmental DNA

eDNA samples were collected upstream and downstream of PSCIS crossing 198692 in 2025 as part of the program-wide eDNA sampling effort. Per-position detection results are presented in Table 5.41. Detections are based on the standard ddPCR call threshold of ≥4 positive droplets; format is CODE(max_droplets), with * flagging samples UNBC reran. Site-level detail across all sampled crossings is in Appendix - Environmental DNA Results, and the interactive Peace eDNA map provides a toggleable per-species view.

edna_results_198692_mon |>
  fpr::fpr_kable(
    caption_text = paste0("eDNA detection results at crossing ", my_site, "."),
    scroll = FALSE
  )

Table 5.41: eDNA detection results at crossing 198692.

Site ID	UNBC ID	Detected	Sub-threshold	Not detected
198692_ds_ed1b	M41362	RAIN(119)	BULT(1)	GRAY(0), SOCK(0)
198692_ds_ed2	M41363	RAIN(630)	—	BULT(0), GRAY(0), SOCK(0)
198692_us_ed1	M41364	RAIN(235)	—	BULT(0), GRAY(0), SOCK(0)

Conclusion

Baseline fish and eDNA data were collected at PSCIS crossing 198692 in 2025 to inform future effectiveness monitoring once remediation completes. Resampling at the site once the structure is upgraded will allow direct comparison of fish abundance and habitat conditions before and after the intervention.