Regional Stream Quality Assessments



The Pacific Northwest Regional Stream Quality Assessment (PNSQA)


Algae, benthic invertebrates, and fish communities were sampled and physical habitat assessed once at all 88 sites during the summer of 2015. Samples were collected along multiple transects within the stream reach following USGS NAWQA protocols.

Water samples were collected weekly at 88 sites for up to 10 weeks preceding the ecological sampling. Water samples were analyzed for nutrients, suspended sediment, major ions, and about 230 dissolved pesticides and pesticide degradates. Selected samples also were analyzed for mercury, pharmaceuticals, wastewater indicator compounds, and hormones.

Passive polar organic chemical integrative samplers (POCIS) were deployed at 75 sites for about 7 weeks to collect dissolved chemicals from stream water. The POCIS are designed to accumulate chemicals such as water-soluble pesticides and degradates, pharmaceuticals, and wastewater indicator compounds.

Streambed sediment was sampled coincident with the ecological sampling at all 88 sites. Stream bottom sediment was collected from depositional areas, composited, and sieved. Sediment samples were analyzed for trace elements, polycyclic aromatic hydrocarbons (PAHs), hormones and organic waste indicator compounds, and halogenated organic compounds (compounds, such as DDT, that contain chlorine or bromine atoms).

Bed-sediment samples from the 44 urban and agricultural sites were used in standard whole-sediment toxicity tests conducted with amphipod crustaceans (Hyalella azteca 28-day exposures), midge larvae (Chironomus dilutus 10-day exposures) and freshwater mussels (Lampsilis siliquoidea 28-day exposures) to measure potential effects of contaminants on survival and growth. Amphipods, midges, and mussels are sensitive to many contaminants, notably metals and organic contaminants, including insecticides in current use.

Stream water-level and temperature were monitored continuously at all 88 sites. Continuous monitoring at 6 sites for characteristics such as the amount of dissolved oxygen in water and nitrate concentration, in conjunction with periodic sampling of nutrients and the attached-algal biomass, is providing useful information on the effects of nutrients in streams.

Small-volume automated pesticide samplers were deployed at 7 urban streams to assess temporal variations in about 230 pesticides and pesticide degradation products. The samplers collected daily and weekly composite samples. Results provide useful information for determining short-term acute exposure of aquatic organisms to pesticides and for optimizing temporal sampling strategies.

PNSQA Sites
State Site Number Station Name Latitude Longitude
Oregon 14142800 BEAVER CREEK AT trOUtdALE, OR 45.519 -122.388
Oregon 14164500 MILL CREEK AT WENDLING, OR 44.191 -122.799
Oregon 14194300 NORth YAMHILL RIVER NEAR FAIRDALE, OR 45.365 -123.378
Oregon 14200300 SILVER CREEK AT SILVERTON, OR 45.009 -122.788
Oregon 14201300 ZOLLNER CREEK NEAR MT ANGEL, OR 45.1 -122.821
Oregon 14202920 SAIN CREEK NEAR GASTON, OR 45.48 -123.245
Oregon 14205400 EAST FORK DAIRY CREEK NEAR MEACHAM CORNER, OR 45.682 -123.069
Oregon 14206950 FANNO CREEK AT DURHAM, OR 45.403 -122.754
Oregon 14211499 KELLEY CREEK AT SE 159th DRIVE AT PORTLAND, OR 45.476 -122.498
Oregon 440257123103200 AMAZON CREEK NEAR DANEBO ROAD AT EUGENE, OR 44.049 -123.176
Oregon 440656122491200 CAMP CREEK AT UPPER CAMP CR RD, NR WALTERVILLE, OR 44.115 -122.819
Oregon 441033122524900 PARSONS CREEK AT PARSONS CREEK RD, NR MARCOLA, OR 44.175 -122.88
Oregon 442349122440300 AMES CREEK AT HWY 20, AT SWEET HOME, OR 44.397 -122.734
Oregon 443243123265400 WOODS CREEK AT WOODS CREEK RD, NEAR PHILOMAth, OR 44.545 -123.448
Oregon 443423123153700 DIXON CREEK AT 6th ST, AT CORVALLIS, OR 44.573 -123.26
Oregon 443436123023600 OAK CREEK AT FRY RD SE, NEAR ALBANY, OR 44.576 -123.043
Oregon 443808123051100 PERIWINKLE CREEK AT SANTIAM RD SE, AT ALBANY, OR 44.635 -123.086
Oregon 445029122592600 BATTLE CREEK NEAR TURNER, OR 44.841 -122.991
Oregon 445420123041900 CROISAN CREEK AT MADRONA AVE S, AT SALEM, OR 44.905 -123.071
Oregon 445551123015800 PRINGLE CREEK AT SALEM, OR 44.93 -123.033
Oregon 445750123032900 GLENN CREEK AT HARRITT DR NW, SALEM, OR 44.963 -123.058
Oregon 445819123042500 BRUSH COLLEGE CR IN BRUSH COLLEGE PARK, SALEM, OR 44.972 -123.073
Oregon 450016123012800 CLAGGETT CREEK AT NORth RIVER ROAD AT KEIZER, OR 45.004 -123.025
Oregon 451033122275700 MILK CREEK AT S DHOOGE RD, NEAR COLTON, OR 45.175 -122.465
Oregon 451244123050200 W.F. PALMER CREEK AT WEBFOOT ROAD NR DAYTON, OR 45.212 -123.085
Oregon 451350122221100 CLEAR CREEK AT METZLER PARK, NR SPRINGWATER, OR 45.23 -122.369
Oregon 451818122575500 HESS CR AT FOOTPAth, GEORGE FOX UNIV, NEWBERG, OR 45.304 -122.965
Oregon 452414122213200 TICKLE CREEK NEAR BORING, OR 45.403 -122.36
Oregon 452431122303200 ROCK CREEK NEAR MOUth, NEAR DAMASCUS, OR 45.408 -122.51
Oregon 452538122213700 NORth FORK DEEP CR AT SE CHURCH RD, BORING, OR 45.427 -122.36
Oregon 452543122372300 KELLOGG CR BELOW MT SCOTT CR, NR MILWAUKIE, OR 45.428 -122.623
Oregon 452912122291200 JOHNSON CREEK AT CIRCLE AVE, OR 45.486 -122.487
Oregon 453115122540800 BEAVERTON CREEK AT NE 75th AVE, AT QUATAMA, OR 45.52 -122.902
Oregon 453145122534500 ROCK CREEK NEAR NW CHERRY LANE, NEAR ORENCO, OR 45.529 -122.895
Oregon 453506123125700 ILER CREEK NEAR FOREST GROVE, OR 45.584 -123.217
Washington 12024000 SOUth FORK NEWAUKUM RIVER NEAR ONALASKA, WA 46.575 -122.685
Washington 12027555 PRAIRIE CR 0.7 MI UPS FR MOUth NR GRAND MOUND, WA 46.792 -123.034
Washington 12068500 DEWATTO RIVER NEAR DEWATTO, WA 47.469 -123.027
Washington 12069550 BIG BEEF CREEK NEAR SEABECK, WA 47.64 -122.785
Washington 12070000 DOGFISH CREEK NEAR POULSBO, WA 47.752 -122.644
Washington 12072660 OLALLA CREEK AT BURLEY OLALLA ROAD NEAR OLALLA, WA 47.431 -122.575
Washington 12072679 CRESCENT CR AT CRESCENT VAL DR NR GIG HARBOR, WA 47.357 -122.578
Washington 12073425 MINTER CREEK ABOVE HUGE CREEK NEAR WAUNA, WA 47.389 -122.695
Washington 12073500 HUGE CREEK NEAR WAUNA, WA 47.389 -122.699
Washington 12073895 COULTER CREEK NEAR ALLYN, WA 47.408 -122.817
Washington 12080800 WOODLAND CREEK BELOW DRAHAM ROAD NEAR LACEY, WA 47.063 -122.808
Washington 12102212 SWAN CREEK AT PIONEER WAY TACOMA, WA 47.228 -122.391
Washington 12107950 NORth FORK NEWAUKUM CREEK NEAR ENUMCLAW, WA 47.234 -121.929
Washington 12110495 JENKINS CREEK NEAR COVINGTION, WA 47.344 -122.123
Washington 12112600 BIG SOOS CREEK ABOVE HATCHERY NEAR AUBURN, WA 47.312 -122.165
Washington 12113205 MILL CREEK AT PEASLEY CANYON RD S NR AUBURN, WA 47.303 -122.264
Washington 12113347 MILL CREEK AT EARthWORKS PARK AT KENT, WA 47.383 -122.224
Washington 12113490 LONGFELLOW CREEK AB GENESEE ST NR WEST SEATTLE, WA 47.563 -122.367
Washington 12117700 ROCK CREEK ABOVE WALSH LAKE DITCH NR LANDSBURG, WA 47.398 -121.921
Washington 12118525 TAYLOR CREEK ABV 236th AVE SE AT MAPLE VALLEY, WA 47.408 -122.026
Washington 12119495 MAY CREEK BELOW HONEY DEW CREEK NEAR RENTON, WA 47.52 -122.196
Washington 12119705 COAL CREEK AT BELLEVUE, WA 47.568 -122.181
Washington 12120000 MERCER CREEK NEAR BELLEVUE, WA 47.602 -122.18
Washington 12120500 JUANITA CREEK NEAR KIRKLAND, WA 47.707 -122.215
Washington 12120600 ISSAQUAH CREEK NEAR HOBART, WA 47.457 -122.005
Washington 12121504 E FORK ISSAQUAH CR ABV 3RD AVE NE AT ISSAQUAH, WA 47.532 -122.03
Washington 12121570 NORth FORK ISSAQUAH CREEK AT ISSAQUAH, WA 47.542 -122.034
Washington 12123100 COTTAGE LAKE CREEK AB BEAR CREEK NEAR REDMOND, WA 47.717 -122.086
Washington 12124490 BEAR CREEK AT UNION HILL RD AT REDMOND, WA 47.675 -122.107
Washington 12125500 BEAR CREEK AT WOODINVILLE, WA 47.756 -122.165
Washington 12126910 SWAMP CREEK NEAR MOUNTLAKE TERRACE, WA 47.792 -122.256
Washington 12128000 thORNTON CREEK NEAR SEATTLE, WA 47.695 -122.276
Washington 12128040 PIPERS CREEK AT CARKEEK PARK, AT SEATTLE, WA 47.711 -122.373
Washington 12145970 PATTERSON CREEK ABV CANYON CREEK NR FALL CITY, WA 47.585 -121.949
Washington 12149490 HARRIS CREEK ABOVE NE 108th ST NR CARNATION, WA 47.693 -121.9
Washington 12150495 CHERRY CREEK BELOW MARGARET CREEK NEAR DUVALL, WA 47.742 -121.941
Washington 12155050 DUBUQUE CREEK BLW PANthER CREEK NR LK STEVENS, WA 47.987 -122.034
Washington 12158040 TULALIP CREEK NEAR TULALIP, WA 48.068 -122.287
Washington 12170000 CHURCH CREEK NEAR STANWOOD, WA 48.233 -122.326
Washington 12200017 EF NOOKACHAMPS CREEK AT HWY 9 NR CLEAR LAKE, WA 48.445 -122.252
Washington 12202300 OLSEN CREEK NEAR BELLINGHAM, WA 48.751 -122.353
Washington 12204010 SQUALICUM CREEK NEAR MOUth AT BELLINGHAM, WA 48.766 -122.499
Washington 12212001 FISHtrAP CREEK AT AARON RD NR LYNDEN, WA 48.962 -122.434
Washington 12212450 BERtrAND CREEK AT WEST BADGER ROAD NEAR LYNDEN, WA 48.963 -122.508
Washington 12212895 TENMILE CREEK ABOVE FOURMILE CREEK NR FERNDALE, WA 48.866 -122.483
Washington 14211902 BURNT BRIDGE CREEK NEAR MOUth AT VANCOUVER, WA 45.661 -122.668
Washington 453429122185500 GIBBONS CREEK AT EVERGREEN HWY, AT WASHOUGAL, WA 45.574 -122.315
Washington 454510122424900 WHIPPLE CREEK NEAR SALMON CREEK, WA 45.75 -122.716
Washington 454533122321200 WEAVER CR AT SE MERRITT DR, NR BATTLE GROUND, WA 45.759 -122.536
Washington 454558122255200 SALMON CREEK AT NE 199th ST, NR VENERSBORG, WA 45.766 -122.431
Washington 454904122441800 GEE CREEK AT ABRAMS PARK, AT RIDGEFIELD, WA 45.817 -122.738
Washington 455122122310600 ROCK CREEK NEAR BATTLE GROUND, WA 45.851 -122.522
Washington 472131122072500 LITTLE SOOS CREEK ABV MOUth NR MAPLE VALLEY 47.358 -122.124