endemic to a single state or province
Regularity: Regularly occurring
Type of Residency: Year-round
Global Range: (5000-20,000 square km (about 2000-8000 square miles)) Range includes only the Umpqua River drainage, Oregon (Page and Burr 2011). The drainage basin encompasses approximately 12,000 square kilometers.
Length: 12 cm
Catalog Number: USNM 126494
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): Cramer & Otaki
Locality: Ore: Umpqua River Roseburg (Ledger Erroneously Says Willamette River), Oregon, United States, North America
- Paratype: Snyder, J. O. 1908. Bulletin of the United States Bureau of Fisheries. 27 (for 1907): 178, fig. 4.
Habitat and Ecology
Habitat Type: Freshwater
Comments: Habitat includes fast rocky riffles (Page and Burr 2011).
Non-Migrant: Yes. At least some populations of this species do not make significant seasonal migrations. Juvenile dispersal is not considered a migration.
Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).
Locally Migrant: No. No populations of this species make annual migrations of over 200 km.
Comments: Probably similar to R. CATARACTAE which feeds on benthic invertebrates.
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 6 - 20
Comments: Lee et al. (1980) mapped 11 collection locations that are well scattered throughout much of the drainage basin..
10,000 - 100,000 individuals
Comments: Total adult population size is unknown but presumably exceeds 10,000. This species appears to be moderately abundant throughout its range (Howe 1978).
Life History and Behavior
Spawns in spring.
IUCN Red List Assessment
Red List Category
Red List Criteria
National NatureServe Conservation Status
Rounded National Status Rank: N3 - Vulnerable
NatureServe Conservation Status
Rounded Global Status Rank: G3 - Vulnerable
Reasons: Occurs in the Umpqua River drainage, Oregon, where common; stable; not significantly threatened.
Total adult population size is unknown but presumably exceeds 10,000. This species appears to be moderately abundant throughout its range (Howe 1978).
Distribution and abundance appear to be stable (Howe 1978; D. Loomis, pers. comm., 1997).
Global Short Term Trend: Relatively stable (=10% change)
Comments: Distribution and abundance appear to be stable (Howe 1978; D. Loomis, pers. comm., 1997).
Global Long Term Trend: Relatively stable (=10% change)
Comments: No currently recognized threats; protective measures already taken; potential threats include poisoning during control projects, logging, and habitat alteration through channelization, dams, and altered stream flow (Howe 1978).
Biological Research Needs: Investigate life history and ecology (Howe 1978).