diff --git a/godoc/redirect/redirect.go b/godoc/redirect/redirect.go
index 3bec5337..8208518c 100644
--- a/godoc/redirect/redirect.go
+++ b/godoc/redirect/redirect.go
@@ -115,7 +115,7 @@ var redirects = map[string]string{
 	"/tour":  "http://tour.golang.org",
 	"/wiki":  "https://github.com/golang/go/wiki",
 
-	"/doc/articles/c_go_cgo.html": "/blog/c-go-cgo",
+	"/doc/articles/c_go_cgo.html":                    "/blog/c-go-cgo",
 	"/doc/articles/concurrency_patterns.html":        "/blog/go-concurrency-patterns-timing-out-and",
 	"/doc/articles/defer_panic_recover.html":         "/blog/defer-panic-and-recover",
 	"/doc/articles/error_handling.html":              "/blog/error-handling-and-go",
@@ -191,9 +191,13 @@ func clHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	target := ""
-	// the first CL in rietveld is about 152046, so only treat the id as
-	// a rietveld CL if it is larger than 150000.
-	if n, err := strconv.Atoi(id); err == nil && n > 150000 {
+
+	if n, err := strconv.Atoi(id); err == nil && isRietveldCL(n) {
+		// TODO: Issue 28836: if this Rietveld CL happens to
+		// also be a Gerrit CL, render a disambiguation HTML
+		// page with two links instead. We'll need to make an
+		// RPC (to maintner?) to figure that out. For now just
+		// redirect to rietveld.
 		target = "https://codereview.appspot.com/" + id
 	} else {
 		target = "https://go-review.googlesource.com/" + id
diff --git a/godoc/redirect/redirect_test.go b/godoc/redirect/redirect_test.go
index a242f4fa..804bfb00 100644
--- a/godoc/redirect/redirect_test.go
+++ b/godoc/redirect/redirect_test.go
@@ -62,6 +62,15 @@ func TestRedirects(t *testing.T) {
 		"/cl/1/":         {302, "https://go-review.googlesource.com/1"},
 		"/cl/267120043":  {302, "https://codereview.appspot.com/267120043"},
 		"/cl/267120043/": {302, "https://codereview.appspot.com/267120043"},
+
+		// Verify that we're using the Rietveld CL table:
+		"/cl/152046": {302, "https://codereview.appspot.com/152046"},
+		"/cl/152047": {302, "https://go-review.googlesource.com/152047"},
+		"/cl/152048": {302, "https://codereview.appspot.com/152048"},
+
+		// And verify we're using the the "bigEnoughAssumeRietveld" value:
+		"/cl/299999": {302, "https://go-review.googlesource.com/299999"},
+		"/cl/300000": {302, "https://codereview.appspot.com/300000"},
 	}
 
 	mux := http.NewServeMux()
diff --git a/godoc/redirect/rietveld.go b/godoc/redirect/rietveld.go
new file mode 100644
index 00000000..81b1094d
--- /dev/null
+++ b/godoc/redirect/rietveld.go
@@ -0,0 +1,1093 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package redirect
+
+// bigEnoughAssumeRietveld is the value where CLs equal or great are
+// assumed to be on Rietveld. By including this threshold we shrink
+// the size of the table below. When Go amasses 150,000 more CLs, we'll
+// need to bump this number and regenerate the list below.
+const bigEnoughAssumeRietveld = 300000
+
+// isRietveldCL reports whether cl was a Rietveld CL number.
+func isRietveldCL(cl int) bool {
+	return cl >= bigEnoughAssumeRietveld || lowRietveldCL[cl]
+}
+
+// lowRietveldCLs are the old CL numbers assigned by Rietveld code
+// review system as used by Go prior to Gerrit which are less than
+// bigEnoughAssumeRietveld.
+//
+// This list of numbers is registered with the /cl/NNNN redirect
+// handler to disambiguate which code review system a particular
+// number corresponds to. In some rare cases there may be duplicates,
+// in which case we might render an HTML choice for the user.
+//
+// To re-generate this list, run:
+//
+// $ cd $GOROOT
+// $ git log 7d7c6a9..94151eb | grep "^    https://golang.org/cl/" | perl -ne 's,^\s+https://golang.org/cl/(\d+).*$,$1,; chomp; print "$_: true,\n" if $_ < 300000' | sort -n | uniq
+//
+// Note that we ignore the x/* repos because we didn't start using
+// "subrepos" until the Rietveld CLs numbers were already 4,000,000+,
+// well above bigEnoughAssumeRietveld.
+var lowRietveldCL = map[int]bool{
+	152046: true,
+	152048: true,
+	152049: true,
+	152050: true,
+	152051: true,
+	152052: true,
+	152055: true,
+	152056: true,
+	152057: true,
+	152072: true,
+	152073: true,
+	152075: true,
+	152076: true,
+	152077: true,
+	152078: true,
+	152079: true,
+	152080: true,
+	152082: true,
+	152084: true,
+	152085: true,
+	152086: true,
+	152088: true,
+	152089: true,
+	152091: true,
+	152098: true,
+	152101: true,
+	152102: true,
+	152105: true,
+	152106: true,
+	152107: true,
+	152108: true,
+	152109: true,
+	152110: true,
+	152114: true,
+	152117: true,
+	152118: true,
+	152120: true,
+	152123: true,
+	152124: true,
+	152128: true,
+	152130: true,
+	152131: true,
+	152138: true,
+	152141: true,
+	152142: true,
+	153048: true,
+	153049: true,
+	153050: true,
+	153051: true,
+	153055: true,
+	153056: true,
+	153057: true,
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+	154073: true,
+	154076: true,
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+	154099: true,
+	154100: true,
+	154101: true,
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+	154108: true,
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