Table 7.12 — Data for selected measures of water quality from undisturbed forest and range water- 

 sheds in the United States, by division, province, and section — continued 





Measures of quality 





Total d 



issolved solids 



Dissolved oxygen 



Water 



temperature 



Suspen 



ded sediment 



Division, province, and section 





(mg/1)' 





(% saturation)^ 



(degrees centigrade) 





mg/1)3 







Percentile" 



Percentile 



Percentile 



Percentile 





15 



50 



85 



15 



50 



85 



15 



50 



85 



15 



50 



85 



2600 Mediterranean 



























2610 California Grassland 



400 



600 



800 



90 



95 



100 



8.0 



18.0 



28.0 



30 



60 



90 



M2610 Sierran Forest 



11 



19 



20 



90 



96 



102 



6.2 



13.8 



15.5 



1 



3 



5 



M2620 California Chaparral 



300 



600 



800 



90 



94 



98 



7.2 



17.8 



24.1 



10 



20 



30 



3100 Steepe 



























3110 Great Plains Shortgrass Prairie 



























31 1 1 Grama-Needlegrass-Wheatgrass 



994 



2189 



3384 



53 



70 



87 



1.4 



9.7 



18.0 



10 



6000 



16186 



3112 Wheatgrass-Needlegrass' 



235 



257 



269 



70 



80 



87 







4.0 



12.0 



25 



47 



81 



3113 Grama-Buffalo Grass 



1491 



1610 



1730 



80 



92 



104 



4.0 



13.0 



21.0 



118 



188 



258 



M3110 Rocky Mountain Forest 



























M3111 Grand Fir-Douglas-fir 



32 



48 



57 



87 



94 



99 



1.5 



8.0 



15.5 



1 



6 



22 



M3112 Douglas-fir 



25 



140 



400 



76 



83 



110 







6.0 



12.0 



7 



25 



300 



M3113 Ponderosa Pine- 



























Douglas-fir 



38 



52 



60 



65 



73 



78 







4.0 



11.0 



2 



4 



9 



3120 Palouse Grassland 



200 



250 



300 



60 



70 



80 



2.0 



10.0 



17.0 



50 



500 



5000 



M3120 Upper Gila Mountains Forest 



63 



128 



173 



73 



87 



114 



6.0 



11.0 



21.0 



1 



2 



20 



3130 Intermountain Sagebrush 



























3131 Sagebrush-Wheatgrass 



85 



109 



124 



9 



11 



12 



2.0 



11.0 



24.0 



4 



9 



57 



3132 Lahontan Saltbush- 



























Greasewood 



50 



80 



100 



74 



79 



84 



1.0 



8.0 



15.0 



13 



30 



177 



3133 Great Basin Sagebrush 



70 



80 



100 



73 



80 



90 



1.0 



8.0 



15.0 



2 



25 



1970 



3134 Bonneville Saltbush- 



























Greasewood 



1000 



1400 



3200 



70 



80 



90 



2.0 



9.0 



15.0 



10 



30 



2000 



3135 Ponderosa Shrub Forest 



55 



59 



66 



75 



85 



95 



1.0 



14.0 



19,0 



5.6 



17.5 



59.5 



P 3130 Colorado Plateau 



























P3131 Juniper-Pinyon Woodland+ 



























Sagebrush-Saltbush Mosaic 



150 



225 



350 



70 



85 



100 



4.0 



13.0 



21.0 



5 



25 



500 



P 3132 Grama-Galleta Steepe + 



























Juniper-Pinyon Woodland 



158 



228 



390 



85 



95 



145 



5.0 



16.0 



23.0 



19800 



24800 



37900 



3140 Mexican Highlands Shrub 



427 



915 



1180 



95 



105 



105 



15.0 



25.0 



33.0 



14200 



68940 



111000 



A3140 Wyoming Basin 



























A 31 41 Wheatgrass-Needlegrass- 



























Sage 



220 



495 



770 



78 



87 



96 



2.0 



9.0 



17.0 



78 



850 



1622 



A 3142 Sagebrush-Wheatgrass 



190 



267 



344 



71 



82 



93 



2.0 



9.0 



17.0 



1 



191 



565 



3200 Desert 



























3210 Chihuahuan Desert 



























3211 Grama-Tobosa 



1900 



2450 



2990 



100 



120 



130 



8.0 



18.0 



27.0 



12 



55 



86 



3212 Tarbush-Creosote Bush 



93 



114 



132 



— 



— 



— 



13.0 



21.0 



25.0 



— 







— 



3220 American (Mojave-Colorado- 



























Sonoran) 



























3221 Creosote Bush 



509 



541 



603 



70 



105 



140 



13.0 



21.0 



28.0 



7 



576 



1030 



3222 Creosote Bush-Bur Sage 



600 



700 



800 



60 



70 



100 



13.0 



26.0 



32.0 



1000 



5000 



20000 



4200 Rainforest 



























M4210 Hawaiian Islands 



22 



33 



51 



89 



94 



100 



17.0 



19.0 



20.0 







1 



3 



'All solid material that passes through a filter membrane having pores of 0.45 

 micron in diameter. Measured in milligrams per liter (mg/1). 



'The ratio of the amount of dissolved oxygen present in water at a given 

 temperature to the amount of dissolved oxygen water can hold at that tempera- 

 ture, expressed as a percent. 



'The inorganic particles larger than 0.45 micron in diameter carried in sus- 

 pension by the water. Measured in milligrams per liter (mg/1). 



' Percentile figures are determined from an analysis of a frequency distribution. 

 The 50th percentile represents the median (midpoint) ot the data and a range is 

 selected in which 70 percent of the data falls between the 15th and 85th 

 percentiles. 



' Figures in ( ) are for streams with a major contribution from glacial melt and 

 are for the same ecoregions as figures immediately preceeding. 



^Suspended sediment figures for Yukon Forest do not include that measured in 

 the Yukon River which is a glacial melt river originating in Canada. 



'These figures represent only the Black Hills portion of this ecoregion. 



Note: Numbers before the division, province, and section designations refer to 

 lowland ecoregions as described in Forest Service, U-S. Department of Agricul- 

 ture, Ecoregions ot the United States. 1976 Letters with the numbers, i.e., M1310, 

 P3131, A3142, etc., indicate highland ecoregions in which M = mountains, P = 

 plateau, and A = altiplano (a high plateau or plain). 



Source: U.S. Environmental Protection Agency. National Water Quality Data 

 Storage and Retrieval Program (STORET). 



304 



