Goodwin Dam is where it starts
Every fish in the lower Stanislaus lives downstream of Goodwin Dam, built in 1913 by the Oakdale and South San Joaquin irrigation districts about 2.5 miles above Knights Ferry to turn the river into their canals. Above it sit Tulloch Reservoir and the 625-foot New Melones Dam, finished in 1979. Goodwin cut salmon and steelhead off from roughly half the spawning habitat the basin once had, and what is left is a cold, managed river whose volume is decided in water-rights negotiations rather than by snowmelt.
The first 2.5 miles below the dam are a Class IV to V canyon run by whitewater boaters. Knights Ferry is where the river opens up, at the 330-foot covered bridge rebuilt after the flood of 1862 and closed to cars in 1985, and from there down past Horseshoe and Orange Blossom the water is Class I to II. Along the lower river most land is private, but there are sixteen public access points between New Melones and the San Joaquin, including the Knights Ferry Recreation Area, Horseshoe, Orange Blossom, Jacob Myers Park, and the Oakdale and McHenry recreation areas.
Oakdale's Highway 120 bridge splits the rules
CDFW's 2026 regulations give the Stanislaus two sections, and both close from November 1 through December 31. From Goodwin Dam down to the Highway 120 bridge in Oakdale, the season is January 1 through October 31, only artificial lures with barbless hooks, and you may keep 2 hatchery trout or steelhead with a healed adipose clip, 4 in possession. That is the Knights Ferry, Horseshoe and Orange Blossom water. From the Highway 120 bridge to the mouth, the same dates and limits apply but bait is legal, with hook-gap limits from April 1 through the Friday before the fourth Saturday in May.
There is no Chinook season on the Stanislaus, and wild trout and steelhead, the ones with an adipose fin, must be released. Practically that makes the upper section a catch-and-release fly and lure river for ten months a year.
Pulse flows and the Ripon number
The gauge on this page is at Ripon, where Highway 99 crosses, about 15 miles above the San Joaquin and a long way below Knights Ferry. It reads what Goodwin releases minus what is taken out between, so treat it as a trend line. For the release itself, Reclamation's Goodwin station is on CDEC as GDW. No shop publishes a wading range for either. The 350 to 750 cfs on this page is the summer and fall band of USGS monthly means at Ripon since 2010: about 709 in July, 597 in August, 357 in September and 716 in October, the month the fall pulse arrives. On September 24, 2026 it read 165, well under that band.
Those pulses have been released each spring and fall since 1992 to imitate snowmelt and autumn storms. They are a fight every dry year; in April 2015 the irrigation districts closed the gates at Tulloch Dam for several hours to stop a fish release. A 2017 FISHBIO study found young salmon moved downstream about the same at 700 cfs as at the required 1,200 to 1,500.
Chinook counts and a threatened steelhead run
Fall Chinook are the river's headline and its warning. Counts have run from 35,000 in 1953 to zero in 1977, and the twenty-first-century average is 3,558; higher fall flows in 2015 brought back more than 11,000 while the Tuolumne and Merced got fewer than a thousand each. Spring-run Chinook are gone from the watershed and the steelhead are listed as threatened. Spawning needs water under 55 degrees, which is why fall release timing matters so much. FISHBIO has also run a predator study on the river since 2017 under the Stanislaus Native Fish Plan, looking at the non-native predators that eat young salmon.
For an angler that means the trout you catch between Knights Ferry and Oakdale may be young steelhead; handle them as if they were, and give spawning gravel a wide berth in fall.
Small flies for a cold valley river
No shop publishes a Stanislaus hatch chart. The rows on this page borrow the lower Yuba chart from Reel Anglers, another cold Central Valley tailwater below a Sierra dam, and should be treated as a starting point. That means midges all year, Blue-Winged Olives in the cool months, PMDs from spring through summer, caddis in the warm evenings and hoppers late in summer. With the season closed in November and December, the productive windows are January through April and the cooler mornings of September and October.