I've known rivers (Puzzle No. 3242)

This week's puzzle manages to work at least one river into each clue.

Link to Puzzle:  http://www.thenation.com/article/168116/puzzle-no-3242

Hozom's Comment: "The Chicken and the Egg."  I wonder if Hot and Trazom had a burgeoning file of river clues somewhere...

Themework: 100%(!)  Always easier when you're theming in the clues.

Difficulty (by standards of this weekly puzzle):  Easy

Political content: None this week

solution and comments below the fold

Legend: "*" anagram; "~" sounds like; "<" letters reversed; "( )" letters inserted; "_" letters deleted; "†" explicit in the clue

Across

1a	WA | R | RIO | R	WA (Washington) + R (restricted) + RIO + ("river" in Spanish [South America]) + R (right).
5a	F | INCHES	F (first letter of "fox") + INCHES (moves slowly).
9a	*EX (PO) S	EXS (anagram [perverse] of "sex") containing (on banks of) PO.
10a	LEMON | DROP	LEMON (yellow) + DROP (duck).  Favoring an elegant clue (yellow duck) over a precise definition (drop =? duck)
11a	PUN | K | ROCK	PUN (wordplay) + K (king) + _Rock_ HUDSON.  Nice assemblage.
12a	*BE (S) TIR	*TIBER containing (winding around) S (initial of "sleeper").  A single indicator calls out both the container and the anagram.
14a	S | <ODA<	S_chuylkill_ + ODA (reversal [returning] of ADO "trouble")
15a	TE (L) E  | *SCOPE	TEE (peg) containing (takes) L (left) + *PECOS
17a	*NIE(*LS BO)HR	*LOBS (anagram indicated by "bombs") contained in (in) *RHINE (anagram indicated by "rolling")
19a	NE (A) T	NET (seine) containing (engulfs) A
22a	GO (AW) A | Y	GOA (state in southwest India) containing (within) "AW, _shucks_" + Y_angtze.  Goa was once a Portuguese colony, influencing the cuisine, which features the fresh fish of the nearby sea.
23a	A | SWAN | DAM	A + SWAN (waterfowl) + DAM (female).  The Aswan High Dam, constructed in the 1960s, changed Egypt forever by ending the annual floods of the Nile.
26a	*GALVESTON	Anagram of (eddying) "Volga sent."  Galveston is a city in Texas, at the Gulf of Mexico end of the Houston Ship Channel
27a	ST (A) TE	ST TE (St. Lawrence) containing (encircling) A
28a	E | URA | <SI< | A	[!--"Where Ural largely exists"] URA_l_ + SI (reversal [toward the west] of IS [exists]) contained in E_ngland_ + C_hina_.  Rebus, container, and reversal: nice clue.
29a	COW | *PEA | S	COW (buffalo, as in "intimidate" + *APE (anagram indicated by "chewed") + S_hannon_

Down

1d	W | HELP	W_abash_ + HELP (aid). Johnny Cash: Wabash Cannonball (in honor of my mother, a Hoosier)
2d	*RIPENED	Anagram of (twisted) "DNIEPER"
3d	*INSER | T	Anagram of (fermented) "RESIN" + T_igris_
4d	*RELOCATION	Anagram (wild) of "CAT ON LOIRE."  Some may gripe about the indicator not being separated from the anagram, but I think it's clever and edgy.  This isn't a beginner's cryptic.
5d	oF A Mekong	Indicated by "bridge"
6d	NO (*NSEN) SE	NOSE (snoop) containing (around) anagram (in flux) of Enns.  That's a stretch, but the Enns is an Austrian tributary of the Danube.
7d	HO | RATIO	I'll call this an "inverted clue" "Ho" is two tenths (a ratio) of "Housatonic."  Elegant.
8d	*SUPERHEAT	Anagram indicated by "nuked"
13d	*ULTRASONIC	Anagram indicated by "deprogrammed"
14d	*SYNAGOGUE	Anagram indicated by "revisited"
16d	E | <SCAP | EES<	Reversal ("on the rise") of SEE (watch) + PACS (campaign groups) preceded by ("supporting") delawarE.  Does Trazom or Hot have a Philadelphia connection?  We get both Schuylkill and Delaware in the clues.
18d	<E-TA (I) LER<	Reversal ("getting up") of RELATE (tell) containing (about) I (the first)
20d	*ENDGAME	Anagram indicated by "Mystic"
21d	WAR | SAW	WAR (fighting) + SAW (gnome).  Didn't know that second definition of "gnome"
24d	M (fEET) S	MS (abbreviation for Mississippi [MI is Michigan]) containing (keeping) _f_EET.
25d	<ETTAlp<	Container and reversal both indicated by "backtracking through."  What would constructors do without an Etta James soundtrack?