M-M model parameter values determined from nonlinear regression were derived from strong model fits with reasonable values. Umax was 19.8 and 4.3 times greater than Uamb in Beehive and Middle Fork, respectively, while Km was 12 and 3.5 times greater than ambient NO3-N (Table 3). The dynamic TASCC (Utot-dyn) and TASCC mass-balance (Utot-dyn-MB) approaches yielded very similar assessment of in-stream nutrient uptake (Fig. 5). Linear regression of these two approaches demonstrated the two were indistinguishable with r2 of >0.999 and P value <0.0001 (Fig. 5).