Lake Selmac (Josephine)

Reachcode: 17100311011257 | Area: 139.8 acres | Shoreline: 3.5 mi | View on Interactive Map

(From Atlas of Oregon Lakes, Johnson et al. 1985)  Selmac Lake is a reservoir formed in 1961 by the construction of a 34-foot high earthfill dam across McMullin Creek, tributary to Deer Creek. The dam is seven miles upstream from Deer Creek's confluence with the Illinois River. Selmac Lake is owned and operated by the Josephine County Parks and Recreation Department and serves a variety of purposes -- for public recreation, for irrigation, and for domestic use. Lake Selmac County Park, a 300-acre tract, includes 50 acres on the south shore developed for use: there is a campground, a picnic area, and boat launching facilities. There is also a small private campground at the lake. Recreational use by people from the Grants Pass area is quite heavy. Rainbow trout were first stocked after construction, followed by other species such as crappies, bluegills, largemouth bass, and catfish. Selmac Lake has developed a reputation for excellent bass fishing and it is open all year. The county has further encouraged angling with the construction of piers into the lake to improve bank fishing.

Selmac Lake is rather shallow with a mean depth of only seven feet; nearly three-quarters of the lake is shallower than 10 feet. The concentrations of major ions are about average for reservoirs in the Rogue River basin, although the concentrations of sodium and chloride are relatively high for a water body so far from the ocean. It shares other characteristics similar to coastal lakes: the alkalinity is low and the conductivity somewhat higher. The concentration of phosphorus observed on 9/4/81 was rather high, possibly because of the recycling of phosphorus from the sediment in the extensive shoal area, or perhaps because of human activity. The chlorophyl concentration was not high, however, and water transparency moderate (Secchi disk depth = 7.9 feet; 2.4 meters), these factors indicate mesotrophic conditions.


Printable Lake Map
No mussel data available.

The list of plants below includes results of aquatic plant surveys conducted by the Center for Lakes and Reservoirs as well as aquatic invasive plant species detections that have been reported to iMap Invasives: an online, GIS-based invasive species reporting and querying tool.

Plants listed in the table below are categorized as native to Oregon, on the Oregon Department of Agriculture’s (ODA’s) Noxious Weed List, on the Federal Noxious Weed List, or non-native but not listed as noxious. Federal Noxious Weed List plants are plants determined by USDA to be serious threats to U.S. agriculture, irrigation, navigation, public health or the environment (7 C.F.R. 360.200). The ODA Noxious Weed categories are:

ODA Class A - weeds either unknown or with small enough infestations to make eradication or containment possible; targeted for eradication or intensive control.

ODA Class B - regionally abundant weeds (may have limited distribution in some counties); targeted for local/regional control on case-by-case basis.

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Date Species Status Source
Aug. 22, 2010 Elodea canadensis (common elodea, Canadian waterweed) Native CLR
Aug. 22, 2010 Ceratophyllum demersum (Coontail; hornwort) Native CLR
Aug. 22, 2010 Potamogeton crispus (curly leaf pondweed) Non-native CLR
Aug. 22, 2010 Myriophyllum spicatum (Eurasian watermilfoil) Non-native ODA Class B CLR
Aug. 22, 2010 Potamogeton sp. (pondweed) Native CLR
Aug. 22, 2010 Najas gracillima (slender waternymph) Non-native CLR
Aug. 22, 2010 Nitella sp. (stonewort) Native CLR
Aug. 22, 2010 Vallisneria americana (water celery) Non-native CLR
Aug. 22, 2010 Ludwigia palustris (water-purslane) Native CLR
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